!op
/MSG %B BAN <nick>
/MSG %B BAN <nick!user@host>
   Places the ban specified.  If only a <nick> is given,
   the user must ben on the channel.  Otherwise, 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
