!op
/MSG %B UNBAN <nick!user@host>
   Removes the ban specified.  A proper ban mask must be
   used, or the request will be rejected.  The ban mask is
   of the format nick!user@host.  No part is optional, but
   wildcards may be used, e.g.  *!loser@*lamer.edu The ban
   mask must be one that is currently on the channel, or is
   on the bot.  Permanent bot bans may not be removed with
   this command.
