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gh-88333: Drop redundant IPv6 private subnets #26209

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gh-88333: Drop redundant IPv6 private subnets #26209

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48ade34
Drop redundant subnets
mjpieters May 18, 2021
3b7ce0d
📜🤖 Added by blurb_it.
blurb-it[bot] May 18, 2021
28cf443
Merge branch 'main' into bpo44167_ipaddress_ipv6private
StanFromIreland Jul 18, 2025
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Drop redundant subnets 
The two dropped networks are wholly contained inside of 2001::/23:

```python
>>> from ipaddress import IPv6Network
>>> sub_tla_id = IPv6Network('2001::/23')
>>> sub_tla_id.supernet_of(IPv6Network('2001:2::/48'))
True
>>> sub_tla_id.supernet_of(IPv6Network('2001:10::/28'))
True
```

Any IP address that tests as private against either 2001:2::/48 or 2001:10::/28 will also test as private against 2001::/23, any IP address that is not part of 2001::/23 will also never be part of the other two.
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@mjpieters
mjpieters committed May 18, 2021
commit 48ade34c2a9f5f0e893c701ca2616cdffe33bb10
2 changes: 0 additions & 2 deletions Lib/ipaddress.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2266,9 +2266,7 @@ class _IPv6Constants:
IPv6Network('::ffff:0:0/96'),
IPv6Network('100::/64'),
IPv6Network('2001::/23'),
IPv6Network('2001:2::/48'),
IPv6Network('2001:db8::/32'),
IPv6Network('2001:10::/28'),
IPv6Network('fc00::/7'),
IPv6Network('fe80::/10'),
]
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