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gh-151049: Add 2001:1::3/128 (RFC 9665) to ipaddress IPv6 global exceptions - #151050
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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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LGTM.
ipaddress _private_networks table refers to https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml which contains 2001:1::3/128: allocated in 2024-04 and refer to RFC 9665.
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Gentle ping — this has been approved (thanks @vstinner) and has carried the |
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@serhiy-storchaka: Would you mind reviewing this fix? |
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This PR is stale because it has been open for 90 days with no activity. |
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I merged your change, thanks for your contribution. I'm sorry, I'm not used to ipaddress anymore, so I don't feel confident to backport the change to stable branches. I would need the support of a second core developer to backport the change. |
2 participants
IANA's IPv6 Special-Purpose Address Registry (2024-04) lists
2001:1::3/128("DNS-SD Service Registration Protocol Anycast", RFC 9665) with
Globally Reachable = True, like its neighbours
2001:1::1/128(PCP, RFC 7723)and
2001:1::2/128(TURN, RFC 8155)._IPv6Constants._private_networks_exceptionscarved out::1and::2(added in GH-113179 for #113171) but never got
::3, soipaddress.ip_address('2001:1::3').is_globalwrongly returnsFalse.This PR adds
IPv6Network('2001:1::3/128')to the exceptions list, with anRFC 9665 reference comment, and extends
testReservedIpv6to assert2001:1::3is global / not private and that the adjacent unregistered2001:1::4stays non-global (so the carve-out is exact). Adds a Misc/NEWS entry.I cross-checked the whole IANA IPv6 registry against the exceptions list: every
other Globally-Reachable entry that sits inside a non-global parent block --
2001:1::1,2001:1::2,2001:3::/32,2001:4:112::/48,2001:20::/28,2001:30::/28, all under2001::/23-- is already present, so2001:1::3isthe only one missing. The two Globally-Reachable blocks that are not inside a
private parent (
64:ff9b::/96,2620:4f:8000::/48) need no exception. Theexceptions list (and the
::1/::2siblings) landed in GH-113179 and firstshipped in 3.13, so this applies to 3.13+.
Before:
>>> ipaddress.ip_address('2001:1::3').is_global FalseAfter:
AI Usage Statement
This contribution was made by the human contributor, who identified the issue
(the IANA 2024-04
2001:1::3/128/ RFC 9665 registration missing from CPython'sIPv6 exceptions table), reproduced it, designed the one-line fix to mirror the
existing
::1/::2entries, wrote the test and the NEWS entry, and reviewedand verified everything. An AI assistant helped with locating the relevant code,
cross-checking the IANA registry, and drafting text. Per the CPython policy that
disclosing AI assistance is appreciated, this is disclosed here.