Type !dns <Ip/Person> and it should work :).

on $*:TEXT:/^[.!@]Dns/Si:#: { 
  tokenize 32 $strip($1-)
  dns $2
  set %dns $nick 
}
on *:DNS:{
  if ($dns(0)) notice %dns 14Dnsing local address:7 $dns(1).addr 14To ip address:4 $dns(1).ip
  else notice %dns You have specified an invalid ip/host address.
  halt
}