Well actually you can find out a persons street etc.. but that person would need to be the registrar for that domain name i know many people on Irc who do own their own domains, and that Info is easily found out

That being said in general the vast majority of Irc users are tied to an ISP and you cannot find out anyone's dead location without having access to those records (full stop)

#mIRC Undernet

Give a man a fish feed him for a day, Teach him to fish, feed him for life