help/opers/whowas

   1 WHOWAS <nick>
   2
   3 WHOWAS will show you the last known host and whois
   4 information for the specified nick.  Depending on the
   5 number of times they have connected to the network, there
   6 may be more than one listing for a specific user.
   7
   8 The WHOWAS data will expire after time.