Interesting: also not my expected behavior. But it looks like according to the help page, this is actually expected behavior (not a bug): https://en.wikipedia.org/wiki/Help:User_contributions#Accessing

Also, if you select the option to "Search for pages containing 1.2.3.4", you'll get the expected search results page. It seems like at some point, somebody added a feature to quickly search for contributions based on IP

Apparently it was added in 2004: rMW7c98afbdb7ae: Handy shortcut: paste in an IP address and click go, redirects to the user… Makes sense on a small wiki, I suppose. It's configurable via $wgEnableSearchContributorsByIP - maybe time to disable it for Wikimedia wikis? It's probably more common that a reader would want to search for an IP-like string than an editor relying on this feature to check an IP's contributions, when we have navpopups etc. these days. (cc @tstarling)

This is incredibly annoying on checkuser.wikimedia.org, where searching the wikitext for IPs is kinda the whole point.

With temporary accounts now in place, maybe it is time to let go of this ?

Change #1185262 had a related patch set uploaded (by TheDJ; author: TheDJ):

[mediawiki/core@master] Remove wgEnableSearchContributorsByIP

https://gerrit.wikimedia.org/r/1185262

In T306325#11154721, @TheDJ wrote:

With temporary accounts now in place, maybe it is time to let go of this ?

Seems reasonable to me, should we tag User-notice?

Change #1185262 merged by jenkins-bot:

[mediawiki/core@master] Remove wgEnableSearchContributorsByIP

https://gerrit.wikimedia.org/r/1185262

In T306325#11161345, @dcausse wrote:

In T306325#11154721, @TheDJ wrote:

With temporary accounts now in place, maybe it is time to let go of this ?

Seems reasonable to me, should we tag User-notice?

I've added a quick entry to https://meta.wikimedia.org/wiki/Tech/News/2025/38