Add-On to List all the user accounts associated to 1 IP

[Zachariah]

Not sure if this is what your looking for.
https://vborg.vbsupport.ru/showthread.php?t=117966

IpInfo is a replacement for the standard 'view users ip' option in
vBulletin. Normally when you click on the view ip button in a user's post
you'll only see his or hers ip address and host name.

With ipInfo you'll get more information. Besides the ip address and host
name you will also see what other users have posted with the same ip
address. That feature can be really good for spotting clones.

Another thing ipInfo will show you is what other ips this user has posted
with and how many times. Could be useful when you want to ban all of the
ips of a user and not just the one of that post.