/msg $C ADDBAN <#channel> <mask|nick> [Reason]
Adds a ban to the channels permanent ban list, remaining in effect until removed with the DELBAN command. If it exactly matches an existing ban already in the list, the reason will be updated. If the existing ban was a timed ban, it will be extended into a permanent ban.
$uSee Also:$u bans, delban, mdelban