Well, you can make it manually this way if you want:

Code:
menu * {
  -
  Load_ip_info:hmake IP 100 | hload -i IP c:\mIRC\ipinfo.ini info
  Rewrite_ip:writeini -n c:\mIRC\ipinfo.ini info $?="User nick:" $?="User ip:"
  Find_ip { findip $?="User nick or IP:" } 
}
alias findip {
  $iif($isid,return,echo -a) $iif($hget(IP,$1),$hget(IP,$1),$hfind(IP,$1,1).data)
}
on *:DISCONNECT: { hfree IP }


And actually the hash table deletes itself upon mirc being closed, too.