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gh-151049: Add 2001:1::3/128 (RFC 9665) to ipaddress IPv6 global exceptions #151050

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Merged
vstinner merged 1 commit into from
Sep 22, 2026
Merged

gh-151049: Add 2001:1::3/128 (RFC 9665) to ipaddress IPv6 global exceptions #151050

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gh-151049: Add 2001:1::3/128 (RFC 9665) to ipaddress IPv6 global exce… 
…ptions

IANA's IPv6 Special-Purpose Address Registry (2024-04) lists 2001:1::3/128
("DNS-SD Service Registration Protocol Anycast", RFC 9665) as globally
reachable, like 2001:1::1/128 and 2001:1::2/128. It was missing from
_IPv6Constants._private_networks_exceptions, so is_global returned False
for it. Add the exception and extend testReservedIpv6.
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@tonghuaroot
tonghuaroot committed Jun 7, 2026
commit ec0c214335b3ea76015a90da2110594e87eb20da
2 changes: 2 additions & 0 deletions Lib/ipaddress.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2394,6 +2394,8 @@ class _IPv6Constants:
_private_networks_exceptions = [
IPv6Network('2001:1::1/128'),
IPv6Network('2001:1::2/128'),
# RFC 9665: https://www.rfc-editor.org/rfc/rfc9665.html
IPv6Network('2001:1::3/128'),
IPv6Network('2001:3::/32'),
IPv6Network('2001:4:112::/48'),
IPv6Network('2001:20::/28'),
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4 changes: 4 additions & 0 deletions Lib/test/test_ipaddress.py
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Expand Up @@ -2488,6 +2488,10 @@ def testReservedIpv6(self):
self.assertFalse(ipaddress.ip_address('2001::').is_global)
self.assertTrue(ipaddress.ip_address('2001:1::1').is_global)
self.assertTrue(ipaddress.ip_address('2001:1::2').is_global)
# gh-151049: RFC 9665 anycast address (IANA 2024-04 registration)
self.assertTrue(ipaddress.ip_address('2001:1::3').is_global)
self.assertFalse(ipaddress.ip_address('2001:1::3').is_private)
self.assertFalse(ipaddress.ip_address('2001:1::4').is_global)
self.assertFalse(ipaddress.ip_address('2001:2::').is_global)
self.assertTrue(ipaddress.ip_address('2001:3::').is_global)
self.assertFalse(ipaddress.ip_address('2001:4::').is_global)
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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Library/2026-06-07-23-30-34.gh-issue-151049.mBlToO.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
:mod:`ipaddress`: fix ``is_global`` and ``is_private`` for the
``2001:1::3/128`` (DNS-SD Service Registration Protocol Anycast) address,
which IANA registered as globally reachable per :rfc:`9665`. It is now
correctly reported with ``is_global`` ``True`` and ``is_private`` ``False``.
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