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[3.14] gh-136752: Clarify documentation for IPv{N}Address.is_reserved (GH-136794) #136827

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Jul 19, 2025
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[3.14] gh-136752: Clarify documentation for IPv{N}Address.is_reserved (GH-136794) #136827

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12 changes: 11 additions & 1 deletion Doc/library/ipaddress.rst
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Expand Up @@ -240,7 +240,16 @@ write code that handles both IP versions correctly. Address objects are

.. attribute:: is_reserved

``True`` if the address is otherwise IETF reserved.
``True`` if the address is noted as reserved by the IETF.
For IPv4, this is only ``240.0.0.0/4``, the ``Reserved`` address block.
For IPv6, this is all addresses `allocated <iana-ipv6-address-space_>`__ as
``Reserved by IETF`` for future use.

.. note:: For IPv4, ``is_reserved`` is not related to the address block value of the
``Reserved-by-Protocol`` column in iana-ipv4-special-registry_.

.. caution:: For IPv6, ``fec0::/10`` a former Site-Local scoped address prefix is
currently excluded from that list (see :attr:`~IPv6Address.is_site_local` & :rfc:`3879`).

.. attribute:: is_loopback

Expand All @@ -261,6 +270,7 @@ 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
.. _iana-ipv6-address-space: https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml

.. method:: IPv4Address.__format__(fmt)

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