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jeffbeetoday at 3:29 AM1 replyview on HN

All address literals other than IPv4 must be prefixed by a tag, such as "IPv6:". The form that I gave is a syntactically valid v6v4 address literal.

https://datatracker.ietf.org/doc/html/rfc5321#section-4.1.3


Replies

thwartedtoday at 6:08 AM

Interesting, TIL. That makes the conversion to @2001 even stranger.