#$EPIC: userip.txt,v 1.3 2006/08/29 18:22:56 sthalik Exp $
userip [<nickname> [<nickname> …] [-cmd <command>]]
This userip command is identical to the userhost command except that the server will return the dotted-quad address (ie, 127.0.0.1) instead of the Fully Qualified Host Name (FQHN, ie, “irc.acronet.net”).
This command is available on undernet-type servers, and hybrid-type servers. A VERY LONG time ago, hybrid used to use USRIP which also still works, but that hasn't been the case for a while. If this command fails, give USRIP a try.