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-rw-r--r--Lib/ipaddress.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/ipaddress.py b/Lib/ipaddress.py
index cb41c52..703fa28 100644
--- a/Lib/ipaddress.py
+++ b/Lib/ipaddress.py
@@ -2375,6 +2375,8 @@ class _IPv6Constants:
IPv6Network('2001:db8::/32'),
# IANA says N/A, let's consider it not globally reachable to be safe
IPv6Network('2002::/16'),
+ # RFC 9637: https://www.rfc-editor.org/rfc/rfc9637.html#section-6-2.2
+ IPv6Network('3fff::/20'),
IPv6Network('fc00::/7'),
IPv6Network('fe80::/10'),
]