Check in the thirdparty libs needed for webkitpy.

Tools/Scripts/webkitpy/thirdparty/webpagereplay/third_party/ipaddr/ipaddr.py

+#!/usr/bin/python
+#
+# Copyright 2007 Google Inc.
+#  Licensed to PSF under a Contributor Agreement.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# permissions and limitations under the License.
+
+"""A fast, lightweight IPv4/IPv6 manipulation library in Python.
+
+This library is used to create/poke/manipulate IPv4 and IPv6 addresses
+and networks.
+
+"""
+
+__version__ = '2.1.10'
+
+import struct
+
+IPV4LENGTH = 32
+IPV6LENGTH = 128
+
+
+class AddressValueError(ValueError):
+    """A Value Error related to the address."""
+
+
+class NetmaskValueError(ValueError):
+    """A Value Error related to the netmask."""
+
+
+def IPAddress(address, version=None):
+    """Take an IP string/int and return an object of the correct type.
+
+    Args:
+        address: A string or integer, the IP address.  Either IPv4 or
+          IPv6 addresses may be supplied; integers less than 2**32 will
+          be considered to be IPv4 by default.
+        version: An Integer, 4 or 6. If set, don't try to automatically
+          determine what the IP address type is. important for things
+          like IPAddress(1), which could be IPv4, '0.0.0.1',  or IPv6,
+          '::1'.
+
+    Returns:
+        An IPv4Address or IPv6Address object.
+
+    Raises:
+        ValueError: if the string passed isn't either a v4 or a v6
+          address.
+
+    """
+    if version:
+        if version == 4:
+            return IPv4Address(address)
+        elif version == 6:
+            return IPv6Address(address)
+
+    try:
+        return IPv4Address(address)
+    except (AddressValueError, NetmaskValueError):
+        pass
+
+    try:
+        return IPv6Address(address)
+    except (AddressValueError, NetmaskValueError):
+        pass
+
+    raise ValueError('%r does not appear to be an IPv4 or IPv6 address' %
+                     address)
+
+
+def IPNetwork(address, version=None, strict=False):
+    """Take an IP string/int and return an object of the correct type.
+
+    Args:
+        address: A string or integer, the IP address.  Either IPv4 or
+          IPv6 addresses may be supplied; integers less than 2**32 will
+          be considered to be IPv4 by default.
+        version: An Integer, if set, don't try to automatically
+          determine what the IP address type is. important for things
+          like IPNetwork(1), which could be IPv4, '0.0.0.1/32', or IPv6,
+          '::1/128'.
+
+    Returns:
+        An IPv4Network or IPv6Network object.
+
+    Raises:
+        ValueError: if the string passed isn't either a v4 or a v6
+          address. Or if a strict network was requested and a strict
+          network wasn't given.
+
+    """
+    if version:
+        if version == 4:
+            return IPv4Network(address, strict)
+        elif version == 6:
+            return IPv6Network(address, strict)
+
+    try:
+        return IPv4Network(address, strict)
+    except (AddressValueError, NetmaskValueError):
+        pass
+
+    try:
+        return IPv6Network(address, strict)
+    except (AddressValueError, NetmaskValueError):
+        pass
+
+    raise ValueError('%r does not appear to be an IPv4 or IPv6 network' %
+                     address)
+
+
+def v4_int_to_packed(address):
+    """The binary representation of this address.
+
+    Args:
+        address: An integer representation of an IPv4 IP address.
+
+    Returns:
+        The binary representation of this address.
+
+    Raises:
+        ValueError: If the integer is too large to be an IPv4 IP
+          address.
+    """
+    if address > _BaseV4._ALL_ONES:
+        raise ValueError('Address too large for IPv4')
+    return Bytes(struct.pack('!I', address))
+
+
+def v6_int_to_packed(address):
+    """The binary representation of this address.
+
+    Args:
+        address: An integer representation of an IPv4 IP address.
+
+    Returns:
+        The binary representation of this address.
+    """
+    return Bytes(struct.pack('!QQ', address >> 64, address & (2**64 - 1)))
+
+
+def _find_address_range(addresses):
+    """Find a sequence of addresses.
+
+    Args:
+        addresses: a list of IPv4 or IPv6 addresses.
+
+    Returns:
+        A tuple containing the first and last IP addresses in the sequence.
+
+    """
+    first = last = addresses[0]
+    for ip in addresses[1:]:
+        if ip._ip == last._ip + 1:
+            last = ip
+        else:
+            break
+    return (first, last)
+
+def _get_prefix_length(number1, number2, bits):
+    """Get the number of leading bits that are same for two numbers.
+
+    Args:
+        number1: an integer.
+        number2: another integer.
+        bits: the maximum number of bits to compare.
+
+    Returns:
+        The number of leading bits that are the same for two numbers.
+
+    """
+    for i in range(bits):
+        if number1 >> i == number2 >> i:
+            return bits - i
+    return 0
+
+def _count_righthand_zero_bits(number, bits):
+    """Count the number of zero bits on the right hand side.
+
+    Args:
+        number: an integer.
+        bits: maximum number of bits to count.
+
+    Returns:
+        The number of zero bits on the right hand side of the number.
+
+    """
+    if number == 0:
+        return bits
+    for i in range(bits):
+        if (number >> i) % 2:
+            return i
+
+def summarize_address_range(first, last):
+    """Summarize a network range given the first and last IP addresses.
+
+    Example:
+        >>> summarize_address_range(IPv4Address('1.1.1.0'),
+            IPv4Address('1.1.1.130'))
+        [IPv4Network('1.1.1.0/25'), IPv4Network('1.1.1.128/31'),
+        IPv4Network('1.1.1.130/32')]
+
+    Args:
+        first: the first IPv4Address or IPv6Address in the range.
+        last: the last IPv4Address or IPv6Address in the range.
+
+    Returns:
+        The address range collapsed to a list of IPv4Network's or
+        IPv6Network's.
+
+    Raise:
+        TypeError:
+            If the first and last objects are not IP addresses.
+            If the first and last objects are not the same version.
+        ValueError:
+            If the last object is not greater than the first.
+            If the version is not 4 or 6.
+
+    """
+    if not (isinstance(first, _BaseIP) and isinstance(last, _BaseIP)):
+        raise TypeError('first and last must be IP addresses, not networks')
+    if first.version != last.version:
+        raise TypeError("%s and %s are not of the same version" % (
+                str(first), str(last)))
+    if first > last:
+        raise ValueError('last IP address must be greater than first')
+
+    networks = []
+
+    if first.version == 4:
+        ip = IPv4Network
+    elif first.version == 6:
+        ip = IPv6Network
+    else:
+        raise ValueError('unknown IP version')
+
+    ip_bits = first._max_prefixlen
+    first_int = first._ip
+    last_int = last._ip
+    while first_int <= last_int:
+        nbits = _count_righthand_zero_bits(first_int, ip_bits)
+        current = None
+        while nbits >= 0:
+            addend = 2**nbits - 1
+            current = first_int + addend
+            nbits -= 1
+            if current <= last_int:
+                break
+        prefix = _get_prefix_length(first_int, current, ip_bits)
+        net = ip('%s/%d' % (str(first), prefix))
+        networks.append(net)
+        if current == ip._ALL_ONES:
+            break
+        first_int = current + 1
+        first = IPAddress(first_int, version=first._version)
+    return networks
+
+def _collapse_address_list_recursive(addresses):
+    """Loops through the addresses, collapsing concurrent netblocks.
+
+    Example:
+
+        ip1 = IPv4Network('1.1.0.0/24')
+        ip2 = IPv4Network('1.1.1.0/24')
+        ip3 = IPv4Network('1.1.2.0/24')
+        ip4 = IPv4Network('1.1.3.0/24')
+        ip5 = IPv4Network('1.1.4.0/24')
+        ip6 = IPv4Network('1.1.0.1/22')
+
+        _collapse_address_list_recursive([ip1, ip2, ip3, ip4, ip5, ip6]) ->
+          [IPv4Network('1.1.0.0/22'), IPv4Network('1.1.4.0/24')]
+
+        This shouldn't be called directly; it is called via
+          collapse_address_list([]).
+
+    Args:
+        addresses: A list of IPv4Network's or IPv6Network's
+
+    Returns:
+        A list of IPv4Network's or IPv6Network's depending on what we were
+        passed.
+
+    """
+    ret_array = []
+    optimized = False
+
+    for cur_addr in addresses:
+        if not ret_array:
+            ret_array.append(cur_addr)
+            continue
+        if cur_addr in ret_array[-1]:
+            optimized = True
+        elif cur_addr == ret_array[-1].supernet().subnet()[1]:
+            ret_array.append(ret_array.pop().supernet())
+            optimized = True
+        else:
+            ret_array.append(cur_addr)
+
+    if optimized:
+        return _collapse_address_list_recursive(ret_array)
+
+    return ret_array
+
+
+def collapse_address_list(addresses):
+    """Collapse a list of IP objects.
+
+    Example:
+        collapse_address_list([IPv4('1.1.0.0/24'), IPv4('1.1.1.0/24')]) ->
+          [IPv4('1.1.0.0/23')]
+
+    Args:
+        addresses: A list of IPv4Network or IPv6Network objects.
+
+    Returns:
+        A list of IPv4Network or IPv6Network objects depending on what we
+        were passed.
+
+    Raises:
+        TypeError: If passed a list of mixed version objects.
+
+    """
+    i = 0
+    addrs = []
+    ips = []
+    nets = []
+
+    # split IP addresses and networks
+    for ip in addresses:
+        if isinstance(ip, _BaseIP):
+            if ips and ips[-1]._version != ip._version:
+                raise TypeError("%s and %s are not of the same version" % (
+                        str(ip), str(ips[-1])))
+            ips.append(ip)
+        elif ip._prefixlen == ip._max_prefixlen:
+            if ips and ips[-1]._version != ip._version:
+                raise TypeError("%s and %s are not of the same version" % (
+                        str(ip), str(ips[-1])))
+            ips.append(ip.ip)
+        else:
+            if nets and nets[-1]._version != ip._version:
+                raise TypeError("%s and %s are not of the same version" % (
+                        str(ip), str(ips[-1])))
+            nets.append(ip)
+
+    # sort and dedup
+    ips = sorted(set(ips))
+    nets = sorted(set(nets))
+
+    while i < len(ips):
+        (first, last) = _find_address_range(ips[i:])
+        i = ips.index(last) + 1
+        addrs.extend(summarize_address_range(first, last))
+
+    return _collapse_address_list_recursive(sorted(
+        addrs + nets, key=_BaseNet._get_networks_key))
+
+# backwards compatibility
+CollapseAddrList = collapse_address_list
+
+# We need to distinguish between the string and packed-bytes representations
+# of an IP address.  For example, b'0::1' is the IPv4 address 48.58.58.49,
+# while '0::1' is an IPv6 address.
+#
+# In Python 3, the native 'bytes' type already provides this functionality,
+# so we use it directly.  For earlier implementations where bytes is not a
+# distinct type, we create a subclass of str to serve as a tag.
+#
+# Usage example (Python 2):
+#   ip = ipaddr.IPAddress(ipaddr.Bytes('xxxx'))
+#
+# Usage example (Python 3):
+#   ip = ipaddr.IPAddress(b'xxxx')
+try:
+    if bytes is str:
+        raise TypeError("bytes is not a distinct type")
+    Bytes = bytes
+except (NameError, TypeError):
+    class Bytes(str):
+        def __repr__(self):
+            return 'Bytes(%s)' % str.__repr__(self)
+
+def get_mixed_type_key(obj):
+    """Return a key suitable for sorting between networks and addresses.
+
+    Address and Network objects are not sortable by default; they're
+    fundamentally different so the expression
+
+        IPv4Address('1.1.1.1') <= IPv4Network('1.1.1.1/24')
+
+    doesn't make any sense.  There are some times however, where you may wish
+    to have ipaddr sort these for you anyway. If you need to do this, you
+    can use this function as the key= argument to sorted().
+
+    Args:
+      obj: either a Network or Address object.
+    Returns:
+      appropriate key.
+
+    """
+    if isinstance(obj, _BaseNet):
+        return obj._get_networks_key()
+    elif isinstance(obj, _BaseIP):
+        return obj._get_address_key()
+    return NotImplemented
+
+class _IPAddrBase(object):
+
+    """The mother class."""
+
+    def __index__(self):
+        return self._ip
+
+    def __int__(self):
+        return self._ip
+
+    def __hex__(self):
+        return hex(self._ip)
+
+    @property
+    def exploded(self):
+        """Return the longhand version of the IP address as a string."""
+        return self._explode_shorthand_ip_string()
+
+    @property
+    def compressed(self):
+        """Return the shorthand version of the IP address as a string."""
+        return str(self)
+
+
+class _BaseIP(_IPAddrBase):
+
+    """A generic IP object.
+
+    This IP class contains the version independent methods which are
+    used by single IP addresses.
+
+    """
+
+    def __eq__(self, other):
+        try:
+            return (self._ip == other._ip
+                    and self._version == other._version)
+        except AttributeError:
+            return NotImplemented
+
+    def __ne__(self, other):
+        eq = self.__eq__(other)
+        if eq is NotImplemented:
+            return NotImplemented
+        return not eq
+
+    def __le__(self, other):
+        gt = self.__gt__(other)
+        if gt is NotImplemented:
+            return NotImplemented
+        return not gt
+
+    def __ge__(self, other):
+        lt = self.__lt__(other)
+        if lt is NotImplemented:
+            return NotImplemented
+        return not lt
+
+    def __lt__(self, other):
+        if self._version != other._version:
+            raise TypeError('%s and %s are not of the same version' % (
+                    str(self), str(other)))
+        if not isinstance(other, _BaseIP):
+            raise TypeError('%s and %s are not of the same type' % (
+                    str(self), str(other)))
+        if self._ip != other._ip:
+            return self._ip < other._ip
+        return False
+
+    def __gt__(self, other):
+        if self._version != other._version:
+            raise TypeError('%s and %s are not of the same version' % (
+                    str(self), str(other)))
+        if not isinstance(other, _BaseIP):
+            raise TypeError('%s and %s are not of the same type' % (
+                    str(self), str(other)))
+        if self._ip != other._ip:
+            return self._ip > other._ip
+        return False
+
+    # Shorthand for Integer addition and subtraction. This is not
+    # meant to ever support addition/subtraction of addresses.
+    def __add__(self, other):
+        if not isinstance(other, int):
+            return NotImplemented
+        return IPAddress(int(self) + other, version=self._version)
+
+    def __sub__(self, other):
+        if not isinstance(other, int):
+            return NotImplemented
+        return IPAddress(int(self) - other, version=self._version)
+
+    def __repr__(self):
+        return '%s(%r)' % (self.__class__.__name__, str(self))
+
+    def __str__(self):
+        return  '%s' % self._string_from_ip_int(self._ip)
+
+    def __hash__(self):
+        return hash(hex(long(self._ip)))
+
+    def _get_address_key(self):
+        return (self._version, self)
+
+    @property
+    def version(self):
+        raise NotImplementedError('BaseIP has no version')
+
+
+class _BaseNet(_IPAddrBase):
+
+    """A generic IP object.
+
+    This IP class contains the version independent methods which are
+    used by networks.
+
+    """
+
+    def __init__(self, address):
+        self._cache = {}
+
+    def __repr__(self):
+        return '%s(%r)' % (self.__class__.__name__, str(self))
+
+    def iterhosts(self):
+        """Generate Iterator over usable hosts in a network.
+
+           This is like __iter__ except it doesn't return the network
+           or broadcast addresses.
+
+        """
+        cur = int(self.network) + 1
+        bcast = int(self.broadcast) - 1
+        while cur <= bcast:
+            cur += 1
+            yield IPAddress(cur - 1, version=self._version)
+
+    def __iter__(self):
+        cur = int(self.network)
+        bcast = int(self.broadcast)
+        while cur <= bcast:
+            cur += 1
+            yield IPAddress(cur - 1, version=self._version)
+
+    def __getitem__(self, n):
+        network = int(self.network)
+        broadcast = int(self.broadcast)
+        if n >= 0:
+            if network + n > broadcast:
+                raise IndexError
+            return IPAddress(network + n, version=self._version)
+        else:
+            n += 1
+            if broadcast + n < network:
+                raise IndexError
+            return IPAddress(broadcast + n, version=self._version)
+
+    def __lt__(self, other):
+        if self._version != other._version:
+            raise TypeError('%s and %s are not of the same version' % (
+                    str(self), str(other)))
+        if not isinstance(other, _BaseNet):
+            raise TypeError('%s and %s are not of the same type' % (
+                    str(self), str(other)))
+        if self.network != other.network:
+            return self.network < other.network
+        if self.netmask != other.netmask:
+            return self.netmask < other.netmask
+        return False
+
+    def __gt__(self, other):
+        if self._version != other._version:
+            raise TypeError('%s and %s are not of the same version' % (
+                    str(self), str(other)))
+        if not isinstance(other, _BaseNet):
+            raise TypeError('%s and %s are not of the same type' % (
+                    str(self), str(other)))
+        if self.network != other.network:
+            return self.network > other.network
+        if self.netmask != other.netmask:
+            return self.netmask > other.netmask
+        return False
+
+    def __le__(self, other):
+        gt = self.__gt__(other)
+        if gt is NotImplemented:
+            return NotImplemented
+        return not gt
+
+    def __ge__(self, other):
+        lt = self.__lt__(other)
+        if lt is NotImplemented:
+            return NotImplemented
+        return not lt
+
+    def __eq__(self, other):
+        try:
+            return (self._version == other._version
+                    and self.network == other.network
+                    and int(self.netmask) == int(other.netmask))
+        except AttributeError:
+            if isinstance(other, _BaseIP):
+                return (self._version == other._version
+                        and self._ip == other._ip)
+
+    def __ne__(self, other):
+        eq = self.__eq__(other)
+        if eq is NotImplemented:
+            return NotImplemented
+        return not eq
+
+    def __str__(self):
+        return  '%s/%s' % (str(self.ip),
+                           str(self._prefixlen))
+
+    def __hash__(self):
+        return hash(int(self.network) ^ int(self.netmask))
+
+    def __contains__(self, other):
+        # always false if one is v4 and the other is v6.
+        if self._version != other._version:
+          return False
+        # dealing with another network.
+        if isinstance(other, _BaseNet):
+            return (self.network <= other.network and
+                    self.broadcast >= other.broadcast)
+        # dealing with another address
+        else:
+            return (int(self.network) <= int(other._ip) <=
+                    int(self.broadcast))
+
+    def overlaps(self, other):
+        """Tell if self is partly contained in other."""
+        return self.network in other or self.broadcast in other or (
+            other.network in self or other.broadcast in self)
+
+    @property
+    def network(self):
+        x = self._cache.get('network')
+        if x is None:
+            x = IPAddress(self._ip & int(self.netmask), version=self._version)
+            self._cache['network'] = x
+        return x
+
+    @property
+    def broadcast(self):
+        x = self._cache.get('broadcast')
+        if x is None:
+            x = IPAddress(self._ip | int(self.hostmask), version=self._version)
+            self._cache['broadcast'] = x
+        return x
+
+    @property
+    def hostmask(self):
+        x = self._cache.get('hostmask')
+        if x is None:
+            x = IPAddress(int(self.netmask) ^ self._ALL_ONES,
+                          version=self._version)
+            self._cache['hostmask'] = x
+        return x
+
+    @property
+    def with_prefixlen(self):
+        return '%s/%d' % (str(self.ip), self._prefixlen)
+
+    @property
+    def with_netmask(self):
+        return '%s/%s' % (str(self.ip), str(self.netmask))
+
+    @property
+    def with_hostmask(self):
+        return '%s/%s' % (str(self.ip), str(self.hostmask))
+
+    @property
+    def numhosts(self):
+        """Number of hosts in the current subnet."""
+        return int(self.broadcast) - int(self.network) + 1
+
+    @property
+    def version(self):
+        raise NotImplementedError('BaseNet has no version')
+
+    @property
+    def prefixlen(self):
+        return self._prefixlen
+
+    def address_exclude(self, other):
+        """Remove an address from a larger block.
+
+        For example:
+
+            addr1 = IPNetwork('10.1.1.0/24')
+            addr2 = IPNetwork('10.1.1.0/26')
+            addr1.address_exclude(addr2) =
+                [IPNetwork('10.1.1.64/26'), IPNetwork('10.1.1.128/25')]
+
+        or IPv6:
+
+            addr1 = IPNetwork('::1/32')
+            addr2 = IPNetwork('::1/128')
+            addr1.address_exclude(addr2) = [IPNetwork('::0/128'),
+                IPNetwork('::2/127'),
+                IPNetwork('::4/126'),
+                IPNetwork('::8/125'),
+                ...
+                IPNetwork('0:0:8000::/33')]
+
+        Args:
+            other: An IPvXNetwork object of the same type.
+
+        Returns:
+            A sorted list of IPvXNetwork objects addresses which is self
+            minus other.
+
+        Raises:
+            TypeError: If self and other are of difffering address
+              versions, or if other is not a network object.
+            ValueError: If other is not completely contained by self.
+
+        """
+        if not self._version == other._version:
+            raise TypeError("%s and %s are not of the same version" % (
+                str(self), str(other)))
+
+        if not isinstance(other, _BaseNet):
+            raise TypeError("%s is not a network object" % str(other))
+
+        if other not in self:
+            raise ValueError('%s not contained in %s' % (str(other),
+                                                         str(self)))
+        if other == self:
+            return []
+
+        ret_addrs = []
+
+        # Make sure we're comparing the network of other.
+        other = IPNetwork('%s/%s' % (str(other.network), str(other.prefixlen)),
+                   version=other._version)
+
+        s1, s2 = self.subnet()
+        while s1 != other and s2 != other:
+            if other in s1:
+                ret_addrs.append(s2)
+                s1, s2 = s1.subnet()
+            elif other in s2:
+                ret_addrs.append(s1)
+                s1, s2 = s2.subnet()
+            else:
+                # If we got here, there's a bug somewhere.
+                assert True == False, ('Error performing exclusion: '
+                                       's1: %s s2: %s other: %s' %
+                                       (str(s1), str(s2), str(other)))
+        if s1 == other:
+            ret_addrs.append(s2)
+        elif s2 == other:
+            ret_addrs.append(s1)
+        else:
+            # If we got here, there's a bug somewhere.
+            assert True == False, ('Error performing exclusion: '
+                                   's1: %s s2: %s other: %s' %
+                                   (str(s1), str(s2), str(other)))
+
+        return sorted(ret_addrs, key=_BaseNet._get_networks_key)
+
+    def compare_networks(self, other):
+        """Compare two IP objects.
+
+        This is only concerned about the comparison of the integer
+        representation of the network addresses.  This means that the
+        host bits aren't considered at all in this method.  If you want
+        to compare host bits, you can easily enough do a
+        'HostA._ip < HostB._ip'
+
+        Args:
+            other: An IP object.
+
+        Returns:
+            If the IP versions of self and other are the same, returns:
+
+            -1 if self < other:
+              eg: IPv4('1.1.1.0/24') < IPv4('1.1.2.0/24')
+              IPv6('1080::200C:417A') < IPv6('1080::200B:417B')
+            0 if self == other
+              eg: IPv4('1.1.1.1/24') == IPv4('1.1.1.2/24')
+              IPv6('1080::200C:417A/96') == IPv6('1080::200C:417B/96')
+            1 if self > other
+              eg: IPv4('1.1.1.0/24') > IPv4('1.1.0.0/24')
+              IPv6('1080::1:200C:417A/112') >
+              IPv6('1080::0:200C:417A/112')
+
+            If the IP versions of self and other are different, returns:
+
+            -1 if self._version < other._version
+              eg: IPv4('10.0.0.1/24') < IPv6('::1/128')
+            1 if self._version > other._version
+              eg: IPv6('::1/128') > IPv4('255.255.255.0/24')
+
+        """
+        if self._version < other._version:
+            return -1
+        if self._version > other._version:
+            return 1
+        # self._version == other._version below here:
+        if self.network < other.network:
+            return -1
+        if self.network > other.network:
+            return 1
+        # self.network == other.network below here:
+        if self.netmask < other.netmask:
+            return -1
+        if self.netmask > other.netmask:
+            return 1
+        # self.network == other.network and self.netmask == other.netmask
+        return 0
+
+    def _get_networks_key(self):
+        """Network-only key function.
+
+        Returns an object that identifies this address' network and
+        netmask. This function is a suitable "key" argument for sorted()
+        and list.sort().
+
+        """
+        return (self._version, self.network, self.netmask)
+
+    def _ip_int_from_prefix(self, prefixlen=None):
+        """Turn the prefix length netmask into a int for comparison.
+
+        Args:
+            prefixlen: An integer, the prefix length.
+
+        Returns:
+            An integer.
+
+        """
+        if not prefixlen and prefixlen != 0:
+            prefixlen = self._prefixlen
+        return self._ALL_ONES ^ (self._ALL_ONES >> prefixlen)
+
+    def _prefix_from_ip_int(self, ip_int, mask=32):
+        """Return prefix length from the decimal netmask.
+
+        Args:
+            ip_int: An integer, the IP address.
+            mask: The netmask.  Defaults to 32.
+
+        Returns:
+            An integer, the prefix length.
+
+        """
+        while mask:
+            if ip_int & 1 == 1:
+                break
+            ip_int >>= 1
+            mask -= 1
+
+        return mask
+
+    def _ip_string_from_prefix(self, prefixlen=None):
+        """Turn a prefix length into a dotted decimal string.
+
+        Args:
+            prefixlen: An integer, the netmask prefix length.
+
+        Returns:
+            A string, the dotted decimal netmask string.
+
+        """
+        if not prefixlen:
+            prefixlen = self._prefixlen
+        return self._string_from_ip_int(self._ip_int_from_prefix(prefixlen))
+
+    def iter_subnets(self, prefixlen_diff=1, new_prefix=None):
+        """The subnets which join to make the current subnet.
+
+        In the case that self contains only one IP
+        (self._prefixlen == 32 for IPv4 or self._prefixlen == 128
+        for IPv6), return a list with just ourself.
+
+        Args:
+            prefixlen_diff: An integer, the amount the prefix length
+              should be increased by. This should not be set if
+              new_prefix is also set.
+            new_prefix: The desired new prefix length. This must be a
+              larger number (smaller prefix) than the existing prefix.
+              This should not be set if prefixlen_diff is also set.
+
+        Returns:
+            An iterator of IPv(4|6) objects.
+
+        Raises:
+            ValueError: The prefixlen_diff is too small or too large.
+                OR
+            prefixlen_diff and new_prefix are both set or new_prefix
+              is a smaller number than the current prefix (smaller
+              number means a larger network)
+
+        """
+        if self._prefixlen == self._max_prefixlen:
+            yield self
+            return
+
+        if new_prefix is not None:
+            if new_prefix < self._prefixlen:
+                raise ValueError('new prefix must be longer')
+            if prefixlen_diff != 1:
+                raise ValueError('cannot set prefixlen_diff and new_prefix')
+            prefixlen_diff = new_prefix - self._prefixlen
+
+        if prefixlen_diff < 0:
+            raise ValueError('prefix length diff must be > 0')
+        new_prefixlen = self._prefixlen + prefixlen_diff
+
+        if not self._is_valid_netmask(str(new_prefixlen)):
+            raise ValueError(
+                'prefix length diff %d is invalid for netblock %s' % (
+                    new_prefixlen, str(self)))
+
+        first = IPNetwork('%s/%s' % (str(self.network),
+                                     str(self._prefixlen + prefixlen_diff)),
+                         version=self._version)
+
+        yield first
+        current = first
+        while True:
+            broadcast = current.broadcast
+            if broadcast == self.broadcast:
+                return
+            new_addr = IPAddress(int(broadcast) + 1, version=self._version)
+            current = IPNetwork('%s/%s' % (str(new_addr), str(new_prefixlen)),
+                                version=self._version)
+
+            yield current
+
+    def masked(self):
+        """Return the network object with the host bits masked out."""
+        return IPNetwork('%s/%d' % (self.network, self._prefixlen),
+                         version=self._version)
+
+    def subnet(self, prefixlen_diff=1, new_prefix=None):
+        """Return a list of subnets, rather than an iterator."""
+        return list(self.iter_subnets(prefixlen_diff, new_prefix))
+
+    def supernet(self, prefixlen_diff=1, new_prefix=None):
+        """The supernet containing the current network.
+
+        Args:
+            prefixlen_diff: An integer, the amount the prefix length of
+              the network should be decreased by.  For example, given a
+              /24 network and a prefixlen_diff of 3, a supernet with a
+              /21 netmask is returned.
+
+        Returns:
+            An IPv4 network object.
+
+        Raises:
+            ValueError: If self.prefixlen - prefixlen_diff < 0. I.e., you have a
+              negative prefix length.
+                OR
+            If prefixlen_diff and new_prefix are both set or new_prefix is a
+              larger number than the current prefix (larger number means a
+              smaller network)
+
+        """
+        if self._prefixlen == 0:
+            return self
+
+        if new_prefix is not None:
+            if new_prefix > self._prefixlen:
+                raise ValueError('new prefix must be shorter')
+            if prefixlen_diff != 1:
+                raise ValueError('cannot set prefixlen_diff and new_prefix')
+            prefixlen_diff = self._prefixlen - new_prefix
+
+
+        if self.prefixlen - prefixlen_diff < 0:
+            raise ValueError(
+                'current prefixlen is %d, cannot have a prefixlen_diff of %d' %
+                (self.prefixlen, prefixlen_diff))
+        return IPNetwork('%s/%s' % (str(self.network),
+                                    str(self.prefixlen - prefixlen_diff)),
+                         version=self._version)
+
+    # backwards compatibility
+    Subnet = subnet
+    Supernet = supernet
+    AddressExclude = address_exclude
+    CompareNetworks = compare_networks
+    Contains = __contains__
+
+
+class _BaseV4(object):
+
+    """Base IPv4 object.
+
+    The following methods are used by IPv4 objects in both single IP
+    addresses and networks.
+
+    """
+
+    # Equivalent to 255.255.255.255 or 32 bits of 1's.
+    _ALL_ONES = (2**IPV4LENGTH) - 1
+    _DECIMAL_DIGITS = frozenset('0123456789')
+
+    def __init__(self, address):
+        self._version = 4
+        self._max_prefixlen = IPV4LENGTH
+
+    def _explode_shorthand_ip_string(self):
+        return str(self)
+
+    def _ip_int_from_string(self, ip_str):
+        """Turn the given IP string into an integer for comparison.
+
+        Args:
+            ip_str: A string, the IP ip_str.
+
+        Returns:
+            The IP ip_str as an integer.
+
+        Raises:
+            AddressValueError: if ip_str isn't a valid IPv4 Address.
+
+        """
+        octets = ip_str.split('.')
+        if len(octets) != 4:
+            raise AddressValueError(ip_str)
+
+        packed_ip = 0
+        for oc in octets:
+            try:
+                packed_ip = (packed_ip << 8) | self._parse_octet(oc)
+            except ValueError:
+                raise AddressValueError(ip_str)
+        return packed_ip
+
+    def _parse_octet(self, octet_str):
+        """Convert a decimal octet into an integer.
+
+        Args:
+            octet_str: A string, the number to parse.
+
+        Returns:
+            The octet as an integer.
+
+        Raises:
+            ValueError: if the octet isn't strictly a decimal from [0..255].
+
+        """
+        # Whitelist the characters, since int() allows a lot of bizarre stuff.
+        if not self._DECIMAL_DIGITS.issuperset(octet_str):
+            raise ValueError
+        octet_int = int(octet_str, 10)
+        # Disallow leading zeroes, because no clear standard exists on
+        # whether these should be interpreted as decimal or octal.
+        if octet_int > 255 or (octet_str[0] == '0' and len(octet_str) > 1):
+            raise ValueError
+        return octet_int
+
+    def _string_from_ip_int(self, ip_int):
+        """Turns a 32-bit integer into dotted decimal notation.
+
+        Args:
+            ip_int: An integer, the IP address.
+
+        Returns:
+            The IP address as a string in dotted decimal notation.
+
+        """
+        octets = []
+        for _ in xrange(4):
+            octets.insert(0, str(ip_int & 0xFF))
+            ip_int >>= 8
+        return '.'.join(octets)
+
+    @property
+    def max_prefixlen(self):
+        return self._max_prefixlen
+
+    @property
+    def packed(self):
+        """The binary representation of this address."""
+        return v4_int_to_packed(self._ip)
+
+    @property
+    def version(self):
+        return self._version
+
+    @property
+    def is_reserved(self):
+       """Test if the address is otherwise IETF reserved.
+
+        Returns:
+            A boolean, True if the address is within the
+            reserved IPv4 Network range.
+
+       """
+       return self in IPv4Network('240.0.0.0/4')
+
+    @property
+    def is_private(self):
+        """Test if this address is allocated for private networks.
+
+        Returns:
+            A boolean, True if the address is reserved per RFC 1918.
+
+        """
+        return (self in IPv4Network('10.0.0.0/8') or
+                self in IPv4Network('172.16.0.0/12') or
+                self in IPv4Network('192.168.0.0/16'))
+
+    @property
+    def is_multicast(self):
+        """Test if the address is reserved for multicast use.
+
+        Returns:
+            A boolean, True if the address is multicast.
+            See RFC 3171 for details.
+
+        """
+        return self in IPv4Network('224.0.0.0/4')
+
+    @property
+    def is_unspecified(self):
+        """Test if the address is unspecified.
+
+        Returns:
+            A boolean, True if this is the unspecified address as defined in
+            RFC 5735 3.
+
+        """
+        return self in IPv4Network('0.0.0.0')
+
+    @property
+    def is_loopback(self):
+        """Test if the address is a loopback address.
+
+        Returns:
+            A boolean, True if the address is a loopback per RFC 3330.
+
+        """
+        return self in IPv4Network('127.0.0.0/8')
+
+    @property
+    def is_link_local(self):
+        """Test if the address is reserved for link-local.
+
+        Returns:
+            A boolean, True if the address is link-local per RFC 3927.
+
+        """
+        return self in IPv4Network('169.254.0.0/16')
+
+
+class IPv4Address(_BaseV4, _BaseIP):
+
+    """Represent and manipulate single IPv4 Addresses."""
+
+    def __init__(self, address):
+
+        """
+        Args:
+            address: A string or integer representing the IP
+              '192.168.1.1'
+
+              Additionally, an integer can be passed, so
+              IPv4Address('192.168.1.1') == IPv4Address(3232235777).
+              or, more generally
+              IPv4Address(int(IPv4Address('192.168.1.1'))) ==
+                IPv4Address('192.168.1.1')
+
+        Raises:
+            AddressValueError: If ipaddr isn't a valid IPv4 address.
+
+        """
+        _BaseV4.__init__(self, address)
+
+        # Efficient constructor from integer.
+        if isinstance(address, (int, long)):
+            self._ip = address
+            if address < 0 or address > self._ALL_ONES:
+                raise AddressValueError(address)
+            return
+
+        # Constructing from a packed address
+        if isinstance(address, Bytes):
+            try:
+                self._ip, = struct.unpack('!I', address)
+            except struct.error:
+                raise AddressValueError(address)  # Wrong length.
+            return
+
+        # Assume input argument to be string or any object representation
+        # which converts into a formatted IP string.
+        addr_str = str(address)
+        self._ip = self._ip_int_from_string(addr_str)
+
+
+class IPv4Network(_BaseV4, _BaseNet):
+
+    """This class represents and manipulates 32-bit IPv4 networks.
+
+    Attributes: [examples for IPv4Network('1.2.3.4/27')]
+        ._ip: 16909060
+        .ip: IPv4Address('1.2.3.4')
+        .network: IPv4Address('1.2.3.0')
+        .hostmask: IPv4Address('0.0.0.31')
+        .broadcast: IPv4Address('1.2.3.31')
+        .netmask: IPv4Address('255.255.255.224')
+        .prefixlen: 27
+
+    """
+
+    # the valid octets for host and netmasks. only useful for IPv4.
+    _valid_mask_octets = set((255, 254, 252, 248, 240, 224, 192, 128, 0))
+
+    def __init__(self, address, strict=False):
+        """Instantiate a new IPv4 network object.
+
+        Args:
+            address: A string or integer representing the IP [& network].
+              '192.168.1.1/24'
+              '192.168.1.1/255.255.255.0'
+              '192.168.1.1/0.0.0.255'
+              are all functionally the same in IPv4. Similarly,
+              '192.168.1.1'
+              '192.168.1.1/255.255.255.255'
+              '192.168.1.1/32'
+              are also functionaly equivalent. That is to say, failing to
+              provide a subnetmask will create an object with a mask of /32.
+
+              If the mask (portion after the / in the argument) is given in
+              dotted quad form, it is treated as a netmask if it starts with a
+              non-zero field (e.g. /255.0.0.0 == /8) and as a hostmask if it
+              starts with a zero field (e.g. 0.255.255.255 == /8), with the
+              single exception of an all-zero mask which is treated as a
+              netmask == /0. If no mask is given, a default of /32 is used.
+
+              Additionally, an integer can be passed, so
+              IPv4Network('192.168.1.1') == IPv4Network(3232235777).
+              or, more generally
+              IPv4Network(int(IPv4Network('192.168.1.1'))) ==
+                IPv4Network('192.168.1.1')
+
+            strict: A boolean. If true, ensure that we have been passed
+              A true network address, eg, 192.168.1.0/24 and not an
+              IP address on a network, eg, 192.168.1.1/24.
+
+        Raises:
+            AddressValueError: If ipaddr isn't a valid IPv4 address.
+            NetmaskValueError: If the netmask isn't valid for
+              an IPv4 address.
+            ValueError: If strict was True and a network address was not
+              supplied.
+
+        """
+        _BaseNet.__init__(self, address)
+        _BaseV4.__init__(self, address)
+
+        # Constructing from an integer or packed bytes.
+        if isinstance(address, (int, long, Bytes)):
+            self.ip = IPv4Address(address)
+            self._ip = self.ip._ip
+            self._prefixlen = self._max_prefixlen
+            self.netmask = IPv4Address(self._ALL_ONES)
+            return
+
+        # Assume input argument to be string or any object representation
+        # which converts into a formatted IP prefix string.
+        addr = str(address).split('/')
+
+        if len(addr) > 2:
+            raise AddressValueError(address)
+
+        self._ip = self._ip_int_from_string(addr[0])
+        self.ip = IPv4Address(self._ip)
+
+        if len(addr) == 2:
+            mask = addr[1].split('.')
+            if len(mask) == 4:
+                # We have dotted decimal netmask.
+                if self._is_valid_netmask(addr[1]):
+                    self.netmask = IPv4Address(self._ip_int_from_string(
+                            addr[1]))
+                elif self._is_hostmask(addr[1]):
+                    self.netmask = IPv4Address(
+                        self._ip_int_from_string(addr[1]) ^ self._ALL_ONES)
+                else:
+                    raise NetmaskValueError('%s is not a valid netmask'
+                                                     % addr[1])
+
+                self._prefixlen = self._prefix_from_ip_int(int(self.netmask))
+            else:
+                # We have a netmask in prefix length form.
+                if not self._is_valid_netmask(addr[1]):
+                    raise NetmaskValueError(addr[1])
+                self._prefixlen = int(addr[1])
+                self.netmask = IPv4Address(self._ip_int_from_prefix(
+                    self._prefixlen))
+        else:
+            self._prefixlen = self._max_prefixlen
+            self.netmask = IPv4Address(self._ip_int_from_prefix(
+                self._prefixlen))
+        if strict:
+            if self.ip != self.network:
+                raise ValueError('%s has host bits set' %
+                                 self.ip)
+        if self._prefixlen == (self._max_prefixlen - 1):
+            self.iterhosts = self.__iter__
+
+    def _is_hostmask(self, ip_str):
+        """Test if the IP string is a hostmask (rather than a netmask).
+
+        Args:
+            ip_str: A string, the potential hostmask.
+
+        Returns:
+            A boolean, True if the IP string is a hostmask.
+
+        """
+        bits = ip_str.split('.')
+        try:
+            parts = [int(x) for x in bits if int(x) in self._valid_mask_octets]
+        except ValueError:
+            return False
+        if len(parts) != len(bits):
+            return False
+        if parts[0] < parts[-1]:
+            return True
+        return False
+
+    def _is_valid_netmask(self, netmask):
+        """Verify that the netmask is valid.
+
+        Args:
+            netmask: A string, either a prefix or dotted decimal
+              netmask.
+
+        Returns:
+            A boolean, True if the prefix represents a valid IPv4
+            netmask.
+
+        """
+        mask = netmask.split('.')
+        if len(mask) == 4:
+            if [x for x in mask if int(x) not in self._valid_mask_octets]:
+                return False
+            if [y for idx, y in enumerate(mask) if idx > 0 and
+                y > mask[idx - 1]]:
+                return False
+            return True
+        try:
+            netmask = int(netmask)
+        except ValueError:
+            return False
+        return 0 <= netmask <= self._max_prefixlen
+
+    # backwards compatibility
+    IsRFC1918 = lambda self: self.is_private
+    IsMulticast = lambda self: self.is_multicast
+    IsLoopback = lambda self: self.is_loopback
+    IsLinkLocal = lambda self: self.is_link_local
+
+
+class _BaseV6(object):
+
+    """Base IPv6 object.
+
+    The following methods are used by IPv6 objects in both single IP
+    addresses and networks.
+
+    """
+
+    _ALL_ONES = (2**IPV6LENGTH) - 1
+    _HEXTET_COUNT = 8
+    _HEX_DIGITS = frozenset('0123456789ABCDEFabcdef')
+
+    def __init__(self, address):
+        self._version = 6
+        self._max_prefixlen = IPV6LENGTH
+
+    def _ip_int_from_string(self, ip_str):
+        """Turn an IPv6 ip_str into an integer.
+
+        Args:
+            ip_str: A string, the IPv6 ip_str.
+
+        Returns:
+            A long, the IPv6 ip_str.
+
+        Raises:
+            AddressValueError: if ip_str isn't a valid IPv6 Address.
+
+        """
+        parts = ip_str.split(':')
+
+        # An IPv6 address needs at least 2 colons (3 parts).
+        if len(parts) < 3:
+            raise AddressValueError(ip_str)
+
+        # If the address has an IPv4-style suffix, convert it to hexadecimal.
+        if '.' in parts[-1]:
+            ipv4_int = IPv4Address(parts.pop())._ip
+            parts.append('%x' % ((ipv4_int >> 16) & 0xFFFF))
+            parts.append('%x' % (ipv4_int & 0xFFFF))
+
+        # An IPv6 address can't have more than 8 colons (9 parts).
+        if len(parts) > self._HEXTET_COUNT + 1:
+            raise AddressValueError(ip_str)
+
+        # Disregarding the endpoints, find '::' with nothing in between.
+        # This indicates that a run of zeroes has been skipped.
+        try:
+            skip_index, = (
+                [i for i in xrange(1, len(parts) - 1) if not parts[i]] or
+                [None])
+        except ValueError:
+            # Can't have more than one '::'
+            raise AddressValueError(ip_str)
+
+        # parts_hi is the number of parts to copy from above/before the '::'
+        # parts_lo is the number of parts to copy from below/after the '::'
+        if skip_index is not None:
+            # If we found a '::', then check if it also covers the endpoints.
+            parts_hi = skip_index
+            parts_lo = len(parts) - skip_index - 1
+            if not parts[0]:
+                parts_hi -= 1
+                if parts_hi:
+                    raise AddressValueError(ip_str)  # ^: requires ^::
+            if not parts[-1]:
+                parts_lo -= 1
+                if parts_lo:
+                    raise AddressValueError(ip_str)  # :$ requires ::$
+            parts_skipped = self._HEXTET_COUNT - (parts_hi + parts_lo)
+            if parts_skipped < 1:
+                raise AddressValueError(ip_str)
+        else:
+            # Otherwise, allocate the entire address to parts_hi.  The endpoints
+            # could still be empty, but _parse_hextet() will check for that.
+            if len(parts) != self._HEXTET_COUNT:
+                raise AddressValueError(ip_str)
+            parts_hi = len(parts)
+            parts_lo = 0
+            parts_skipped = 0
+
+        try:
+            # Now, parse the hextets into a 128-bit integer.
+            ip_int = 0L
+            for i in xrange(parts_hi):
+                ip_int <<= 16
+                ip_int |= self._parse_hextet(parts[i])
+            ip_int <<= 16 * parts_skipped
+            for i in xrange(-parts_lo, 0):
+                ip_int <<= 16
+                ip_int |= self._parse_hextet(parts[i])
+            return ip_int
+        except ValueError:
+            raise AddressValueError(ip_str)
+
+    def _parse_hextet(self, hextet_str):
+        """Convert an IPv6 hextet string into an integer.
+
+        Args:
+            hextet_str: A string, the number to parse.
+
+        Returns:
+            The hextet as an integer.
+
+        Raises:
+            ValueError: if the input isn't strictly a hex number from [0..FFFF].
+
+        """
+        # Whitelist the characters, since int() allows a lot of bizarre stuff.
+        if not self._HEX_DIGITS.issuperset(hextet_str):
+            raise ValueError
+        hextet_int = int(hextet_str, 16)
+        if hextet_int > 0xFFFF:
+            raise ValueError
+        return hextet_int
+
+    def _compress_hextets(self, hextets):
+        """Compresses a list of hextets.
+
+        Compresses a list of strings, replacing the longest continuous
+        sequence of "0" in the list with "" and adding empty strings at
+        the beginning or at the end of the string such that subsequently
+        calling ":".join(hextets) will produce the compressed version of
+        the IPv6 address.
+
+        Args:
+            hextets: A list of strings, the hextets to compress.
+
+        Returns:
+            A list of strings.
+
+        """
+        best_doublecolon_start = -1
+        best_doublecolon_len = 0
+        doublecolon_start = -1
+        doublecolon_len = 0
+        for index in range(len(hextets)):
+            if hextets[index] == '0':
+                doublecolon_len += 1
+                if doublecolon_start == -1:
+                    # Start of a sequence of zeros.
+                    doublecolon_start = index
+                if doublecolon_len > best_doublecolon_len:
+                    # This is the longest sequence of zeros so far.
+                    best_doublecolon_len = doublecolon_len
+                    best_doublecolon_start = doublecolon_start
+            else:
+                doublecolon_len = 0
+                doublecolon_start = -1
+
+        if best_doublecolon_len > 1:
+            best_doublecolon_end = (best_doublecolon_start +
+                                    best_doublecolon_len)
+            # For zeros at the end of the address.
+            if best_doublecolon_end == len(hextets):
+                hextets += ['']
+            hextets[best_doublecolon_start:best_doublecolon_end] = ['']
+            # For zeros at the beginning of the address.
+            if best_doublecolon_start == 0:
+                hextets = [''] + hextets
+
+        return hextets
+
+    def _string_from_ip_int(self, ip_int=None):
+        """Turns a 128-bit integer into hexadecimal notation.
+
+        Args:
+            ip_int: An integer, the IP address.
+
+        Returns:
+            A string, the hexadecimal representation of the address.
+
+        Raises:
+            ValueError: The address is bigger than 128 bits of all ones.
+
+        """
+        if not ip_int and ip_int != 0:
+            ip_int = int(self._ip)
+
+        if ip_int > self._ALL_ONES:
+            raise ValueError('IPv6 address is too large')
+
+        hex_str = '%032x' % ip_int
+        hextets = []
+        for x in range(0, 32, 4):
+            hextets.append('%x' % int(hex_str[x:x+4], 16))
+
+        hextets = self._compress_hextets(hextets)
+        return ':'.join(hextets)
+
+    def _explode_shorthand_ip_string(self):
+        """Expand a shortened IPv6 address.
+
+        Args:
+            ip_str: A string, the IPv6 address.
+
+        Returns:
+            A string, the expanded IPv6 address.
+
+        """
+        if isinstance(self, _BaseNet):
+            ip_str = str(self.ip)
+        else:
+            ip_str = str(self)
+
+        ip_int = self._ip_int_from_string(ip_str)
+        parts = []
+        for i in xrange(self._HEXTET_COUNT):
+            parts.append('%04x' % (ip_int & 0xFFFF))
+            ip_int >>= 16
+        parts.reverse()
+        if isinstance(self, _BaseNet):
+            return '%s/%d' % (':'.join(parts), self.prefixlen)
+        return ':'.join(parts)
+
+    @property
+    def max_prefixlen(self):
+        return self._max_prefixlen
+
+    @property
+    def packed(self):
+        """The binary representation of this address."""
+        return v6_int_to_packed(self._ip)
+
+    @property
+    def version(self):
+        return self._version
+
+    @property
+    def is_multicast(self):
+        """Test if the address is reserved for multicast use.
+
+        Returns:
+            A boolean, True if the address is a multicast address.
+            See RFC 2373 2.7 for details.
+
+        """
+        return self in IPv6Network('ff00::/8')
+
+    @property
+    def is_reserved(self):
+        """Test if the address is otherwise IETF reserved.
+
+        Returns:
+            A boolean, True if the address is within one of the
+            reserved IPv6 Network ranges.
+
+        """
+        return (self in IPv6Network('::/8') or
+                self in IPv6Network('100::/8') or
+                self in IPv6Network('200::/7') or
+                self in IPv6Network('400::/6') or
+                self in IPv6Network('800::/5') or
+                self in IPv6Network('1000::/4') or
+                self in IPv6Network('4000::/3') or
+                self in IPv6Network('6000::/3') or
+                self in IPv6Network('8000::/3') or
+                self in IPv6Network('A000::/3') or
+                self in IPv6Network('C000::/3') or
+                self in IPv6Network('E000::/4') or
+                self in IPv6Network('F000::/5') or
+                self in IPv6Network('F800::/6') or
+                self in IPv6Network('FE00::/9'))
+
+    @property
+    def is_unspecified(self):
+        """Test if the address is unspecified.
+
+        Returns:
+            A boolean, True if this is the unspecified address as defined in
+            RFC 2373 2.5.2.
+
+        """
+        return self._ip == 0 and getattr(self, '_prefixlen', 128) == 128
+
+    @property
+    def is_loopback(self):
+        """Test if the address is a loopback address.
+
+        Returns:
+            A boolean, True if the address is a loopback address as defined in
+            RFC 2373 2.5.3.
+
+        """
+        return self._ip == 1 and getattr(self, '_prefixlen', 128) == 128
+
+    @property
+    def is_link_local(self):
+        """Test if the address is reserved for link-local.
+
+        Returns:
+            A boolean, True if the address is reserved per RFC 4291.
+
+        """
+        return self in IPv6Network('fe80::/10')
+
+    @property
+    def is_site_local(self):
+        """Test if the address is reserved for site-local.
+
+        Note that the site-local address space has been deprecated by RFC 3879.
+        Use is_private to test if this address is in the space of unique local
+        addresses as defined by RFC 4193.
+
+        Returns:
+            A boolean, True if the address is reserved per RFC 3513 2.5.6.
+
+        """
+        return self in IPv6Network('fec0::/10')
+
+    @property
+    def is_private(self):
+        """Test if this address is allocated for private networks.
+
+        Returns:
+            A boolean, True if the address is reserved per RFC 4193.
+
+        """
+        return self in IPv6Network('fc00::/7')
+
+    @property
+    def ipv4_mapped(self):
+        """Return the IPv4 mapped address.
+
+        Returns:
+            If the IPv6 address is a v4 mapped address, return the
+            IPv4 mapped address. Return None otherwise.
+
+        """
+        if (self._ip >> 32) != 0xFFFF:
+            return None
+        return IPv4Address(self._ip & 0xFFFFFFFF)
+
+    @property
+    def teredo(self):
+        """Tuple of embedded teredo IPs.
+
+        Returns:
+            Tuple of the (server, client) IPs or None if the address
+            doesn't appear to be a teredo address (doesn't start with
+            2001::/32)
+
+        """
+        if (self._ip >> 96) != 0x20010000:
+            return None
+        return (IPv4Address((self._ip >> 64) & 0xFFFFFFFF),
+                IPv4Address(~self._ip & 0xFFFFFFFF))
+
+    @property
+    def sixtofour(self):
+        """Return the IPv4 6to4 embedded address.
+
+        Returns:
+            The IPv4 6to4-embedded address if present or None if the
+            address doesn't appear to contain a 6to4 embedded address.
+
+        """
+        if (self._ip >> 112) != 0x2002:
+            return None
+        return IPv4Address((self._ip >> 80) & 0xFFFFFFFF)
+
+
+class IPv6Address(_BaseV6, _BaseIP):
+
+    """Represent and manipulate single IPv6 Addresses.
+    """
+
+    def __init__(self, address):
+        """Instantiate a new IPv6 address object.
+
+        Args:
+            address: A string or integer representing the IP
+
+              Additionally, an integer can be passed, so
+              IPv6Address('2001:4860::') ==
+                IPv6Address(42541956101370907050197289607612071936L).
+              or, more generally
+              IPv6Address(IPv6Address('2001:4860::')._ip) ==
+                IPv6Address('2001:4860::')
+
+        Raises:
+            AddressValueError: If address isn't a valid IPv6 address.
+
+        """
+        _BaseV6.__init__(self, address)
+
+        # Efficient constructor from integer.
+        if isinstance(address, (int, long)):
+            self._ip = address
+            if address < 0 or address > self._ALL_ONES:
+                raise AddressValueError(address)
+            return
+
+        # Constructing from a packed address
+        if isinstance(address, Bytes):
+            try:
+                hi, lo = struct.unpack('!QQ', address)
+            except struct.error:
+                raise AddressValueError(address)  # Wrong length.
+            self._ip = (hi << 64) | lo
+            return
+
+        # Assume input argument to be string or any object representation
+        # which converts into a formatted IP string.
+        addr_str = str(address)
+        if not addr_str:
+            raise AddressValueError('')
+
+        self._ip = self._ip_int_from_string(addr_str)
+
+
+class IPv6Network(_BaseV6, _BaseNet):
+
+    """This class represents and manipulates 128-bit IPv6 networks.
+
+    Attributes: [examples for IPv6('2001:658:22A:CAFE:200::1/64')]
+        .ip: IPv6Address('2001:658:22a:cafe:200::1')
+        .network: IPv6Address('2001:658:22a:cafe::')
+        .hostmask: IPv6Address('::ffff:ffff:ffff:ffff')
+        .broadcast: IPv6Address('2001:658:22a:cafe:ffff:ffff:ffff:ffff')
+        .netmask: IPv6Address('ffff:ffff:ffff:ffff::')
+        .prefixlen: 64
+
+    """
+
+
+    def __init__(self, address, strict=False):
+        """Instantiate a new IPv6 Network object.
+
+        Args:
+            address: A string or integer representing the IPv6 network or the IP
+              and prefix/netmask.
+              '2001:4860::/128'
+              '2001:4860:0000:0000:0000:0000:0000:0000/128'
+              '2001:4860::'
+              are all functionally the same in IPv6.  That is to say,
+              failing to provide a subnetmask will create an object with
+              a mask of /128.
+
+              Additionally, an integer can be passed, so
+              IPv6Network('2001:4860::') ==
+                IPv6Network(42541956101370907050197289607612071936L).
+              or, more generally
+              IPv6Network(IPv6Network('2001:4860::')._ip) ==
+                IPv6Network('2001:4860::')
+
+            strict: A boolean. If true, ensure that we have been passed
+              A true network address, eg, 192.168.1.0/24 and not an
+              IP address on a network, eg, 192.168.1.1/24.
+
+        Raises:
+            AddressValueError: If address isn't a valid IPv6 address.
+            NetmaskValueError: If the netmask isn't valid for
+              an IPv6 address.
+            ValueError: If strict was True and a network address was not
+              supplied.
+
+        """
+        _BaseNet.__init__(self, address)
+        _BaseV6.__init__(self, address)
+
+        # Constructing from an integer or packed bytes.
+        if isinstance(address, (int, long, Bytes)):
+            self.ip = IPv6Address(address)
+            self._ip = self.ip._ip
+            self._prefixlen = self._max_prefixlen
+            self.netmask = IPv6Address(self._ALL_ONES)
+            return
+
+        # Assume input argument to be string or any object representation
+        # which converts into a formatted IP prefix string.
+        addr = str(address).split('/')
+
+        if len(addr) > 2:
+            raise AddressValueError(address)
+
+        self._ip = self._ip_int_from_string(addr[0])
+        self.ip = IPv6Address(self._ip)
+
+        if len(addr) == 2:
+            if self._is_valid_netmask(addr[1]):
+                self._prefixlen = int(addr[1])
+            else:
+                raise NetmaskValueError(addr[1])
+        else:
+            self._prefixlen = self._max_prefixlen
+
+        self.netmask = IPv6Address(self._ip_int_from_prefix(self._prefixlen))
+
+        if strict:
+            if self.ip != self.network:
+                raise ValueError('%s has host bits set' %
+                                 self.ip)
+        if self._prefixlen == (self._max_prefixlen - 1):
+            self.iterhosts = self.__iter__
+
+    def _is_valid_netmask(self, prefixlen):
+        """Verify that the netmask/prefixlen is valid.
+
+        Args:
+            prefixlen: A string, the netmask in prefix length format.
+
+        Returns:
+            A boolean, True if the prefix represents a valid IPv6
+            netmask.
+
+        """
+        try:
+            prefixlen = int(prefixlen)
+        except ValueError:
+            return False
+        return 0 <= prefixlen <= self._max_prefixlen
+
+    @property
+    def with_netmask(self):
+        return self.with_prefixlen