One alternative might be https://exonerator.torproject.org/?ip=1.2.3.4&timestamp=2018-01-01&lang=en

@Huji so we should change the button link on CU tool?

Yes, and in fact, I think we should remove any such links from the CheckUser code, and let the wikis configure them as needed.

We should at least provide some basic Checkuser-toollinks with the
posibility of customization as Huji mentions. I agree to remove dead links
for now.

@Huji @MarcoAurelio can we take a step forward?

I don't know any substitute tool so I'll just remove the link, given that rETOR extension-TorBlock exists and should take care of those automatically, at least in theory.

Idk if this helps but I'm using https://www.xmyip.com/tor-ip-check/$1 as Tor node checker in my own toolset for anonymous users on Fandom

In T190542#4077017, @Huji wrote:

Yes, and in fact, I think we should remove any such links from the CheckUser code, and let the wikis configure them as needed.

One problem we've seen is that often community-customized links go dead and/or have serious issues. I think centralizing them in the code could work better but we would have to be careful about picking the right tools (reliability and privacy wise).

Change 806419 had a related patch set uploaded (by Dreamy Jazz; author: Dreamy Jazz):

[mediawiki/extensions/CheckUser@master] Remove dead-link Tor node checker from checkuser-toollinks

https://gerrit.wikimedia.org/r/806419

This is long term inactive, but as some agreement on removal was made I've made a patch to remove the Tor node checker from the checkuser-toollinks message. Re-addition can happen later if a suitable tool is found.

Change 806419 merged by jenkins-bot:

[mediawiki/extensions/CheckUser@master] Remove dead-link Tor node checker from checkuser-toollinks

https://gerrit.wikimedia.org/r/806419