Last modified: 2014-06-19 16:04:46 UTC
It has been reported on Wikipedia that MediaWiki does not prevent the creation of users with usernames that could be potentially valid IPv6 addresses, and that MediaWiki treats 2001:db8 like 2001:db8::. Furthermore, MediaWiki does not effectively deal with usernames which already are potentially valid IPv6 addresses.
I've tested 1.19 and can't seem to create IPv6 usernames. Current IPv6 names must be migrated, which will be easier when bug 31863 is fixed.
I created a user named 8000:63bf:3fff:fdd2: on mediawiki.org today so I guess this ticket is still valid.
That's not a valid IPv6 address, it's missing a colon at the end.