Directly from wpForo NO, it is not stored as far as i know. It is also against GDPR. But who cares 🙂

BUT you can do it, otherwise. Two ways:

1. Install https://wordpress.org/plugins/when-last-login/ and you will see the IP in Users.

or

2. Install some security plugin that notifies you when anyone has login and their IP.

and compare. Easy.

Thanks. I'm gonna try that plugin to see what happens

Well wpForo doesn't store any such IPs, from what know. No way to do this for old topics.