Comment # 1 on bug 987382 from Christian Boltz

My guess is that 137.65.226.5 (part of NOVELL-NET) is an (auth/whatever) proxy
that sits in front of the wiki.

Unfortunately AbuseFilter doesn't allow to block only usernames, so I can
choose between blocking username _and_ IP (which results in the overblocking
you see) and no auto-blocking (which results in more wiki spam) :-/

I unblocked the IP for now and will ask Micah about how this IP is used when
he's online again. (It's possible to whitelist proxy IPs in Mediawiki, but
first I want to confirm that it really is a proxy ;-)  (If someone can answer
it here, that's of course also welcome ;-)