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gh-92573: Add IPv4Address.ipv6_mapped attribute #92581

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gh-92573: Add IPv4Address.ipv6_mapped attribute #92581

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10 changes: 9 additions & 1 deletion Doc/library/ipaddress.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -222,6 +222,13 @@ write code that handles both IP versions correctly. Address objects are
.. _iana-ipv4-special-registry: https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
.. _iana-ipv6-special-registry: https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml

.. attribute:: ipv6_mapped

This property gives the IPv4-mapped IPv6 address corresponding to this IPv4
address. The resulting :class:`IPv6Address` is in the range
``::ffff:0:0/96`` as defined by :RFC:`4291`. See also
:attr:`~IPv6Address.ipv4_mapped`.

.. method:: IPv4Address.__format__(fmt)

Returns a string representation of the IP address, controlled by
Expand Down Expand Up @@ -321,7 +328,8 @@ write code that handles both IP versions correctly. Address objects are

For addresses that appear to be IPv4 mapped addresses (starting with
``::FFFF/96``), this property will report the embedded IPv4 address.
For any other address, this property will be ``None``.
For any other address, this property will be ``None``. See also
:attr:`~IPv4Address.ipv6_mapped`.

.. attribute:: scope_id

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9 changes: 9 additions & 0 deletions Lib/ipaddress.py
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Expand Up @@ -1379,6 +1379,15 @@ def is_link_local(self):
"""
return self in self._constants._linklocal_network

@property
def ipv6_mapped(self):
"""Return the IPv4-mapped IPv6 address corresponding to this IPv4 address.

Returns:
The corresponding IPv4-mapped IPv6 address.
"""
return IPv6Address(0xffff_0000_0000 | self._ip)


class IPv4Interface(IPv4Address):

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8 changes: 8 additions & 0 deletions Lib/test/test_ipaddress.py
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Expand Up @@ -2368,6 +2368,14 @@ def testIpv4MappedPrivateCheck(self):
self.assertEqual(
False, ipaddress.ip_address('::ffff:172.32.0.0').is_private)

def testIpv6Mapped(self):
self.assertEqual(
ipaddress.ip_address('1.2.3.4').ipv6_mapped,
ipaddress.ip_address('::ffff:102:304'))
self.assertEqual(
ipaddress.ip_address('1.2.3.4').ipv6_mapped,
ipaddress.ip_address('::ffff:1.2.3.4'))

def testAddrExclude(self):
addr1 = ipaddress.ip_network('10.1.1.0/24')
addr2 = ipaddress.ip_network('10.1.1.0/26')
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2022-05-09-23-41-56.gh-issue-92573.e5VQuu.rst
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@@ -0,0 +1,2 @@
Add :attr:`ipaddress.IPv4Address.ipv6_mapped` to mirror
:attr:`ipaddress.IPv6Address.ipv4_mapped`.