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ipaddress: ip_address IPv6 has wrong properties for Shared Address Space (100.64.0.0) #107205
Description
Bug report
For IPv6, the ip_address and ip_network classes disagree on whether the "0:0:0:0:0:FFFF:6440:0000" address is_global and is_private. This behavior changed after python version 3.9, and the code below fails on 3.10+
The IPv6 address "0:0:0:0:0:FFFF:6440:0000" maps to IPv4 "100.64.0.0" using the ::ffff/96 rule from https://www.apnic.net/get-ip/faqs/what-is-an-ip-address/ipv6-address-types/
import ipaddress
ip_addr = ipaddress.ip_address("0:0:0:0:0:FFFF:6440:0000")
ip_net = ipaddress.ip_network("0:0:0:0:0:FFFF:6440:0000")
assert ip_addr.is_global == ip_net.is_global # fails on py 3.10+
assert ip_addr.is_private == ip_net.is_private # fails on py 3.10+
assert ip_addr.is_unspecified == ip_net.is_unspecified
print("ipv6 ok")
ip4_addr = ipaddress.ip_address("100.64.0.0")
ip4_net = ipaddress.ip_network("100.64.0.0")
assert ip4_addr.is_global == ip4_net.is_global
assert ip4_addr.is_private == ip4_net.is_private
assert ip4_addr.is_unspecified == ip4_net.is_unspecified
print("ipv4 ok")
Your environment
Mac OS 13.3.x
Python 3.8, 3.9, 3.10, 3.11
Reference for Shared Address Space https://www.rfc-editor.org/rfc/rfc6598.html
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