The “ipaddress” module contained incorrect information about whether certain IPv4 and IPv6 addresses were designated as “globally reachable” or “private”. This affected the is_private and is_global properties of the ipaddress.IPv4Address, ipaddress.IPv4Network, ipaddress.IPv6Address, and ipaddress.IPv6Network classes, where values wouldn’t be returned in accordance with the latest information from the IANA Special-Purpose Address Registries. CPython 3.12.4 and 3.13.0a6 contain updated information from these registries and thus have the intended behavior. A flaw was found in Python. The ipaddress module contained incorrect information about whether certain IPv4 and IPv6 addresses were designated as “globally reachable” or “private”. Due to this issue, it is possible that values will not be returned in accordance with the latest information from the IANA Special-Purpose Address Registries.
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