I did check the HACKS DB and searched for IRC but "only" three items showed up, none of them were a "Who is on IRC"
I do not have a bot or anything running on that IRC channel ( the channel is not on my server on the web, I just use a free IRC Service )
I also checked the full Releases, and the hacks I found are mainly to integrate a Java Based IRC Chat Module or something else, but not a simple "Who is on IRC on my channel Thingy".