RTSnet merged a while back with AppliedIRC, which seems to be the main branding now. You should still be able to connect via irc.appliedirc.com 6667. The arcengames.com IRC chat page should probably be updated to reflect this change.
As for channel ownership, for some reason, my account and the channel both became unregistered at some point. This probably had something to do with the merger, though it happened sometime after the merger, which was a ways back. *shrugs* It's in good working shape at the moment, anyway, and not a problem, as far as I'm concerned.