Added in 1.7
/ban [-kruN] [#channel] <nickname|address> [type] [reason]
Ban someone from the current channel using their nickname or address.
-k - Kick as well as banning with an optional reason.
-uN - Pause N seconds before removing the ban.
-r - Removes ban instead of adding.
[#channel] - The channel to add/remove the ban.
<nickname|address> - Nick or address to ban.
[type] - Address type, see $mask for available types. (if no type is specified, ban type from Options -> Server -> Default ban type will be used)
[reason] - Optional reason used in combination with -k
;Kicks and bans a nick from channel #test for 1 hour /ban -ku3600 #test Nick Stop Spamming. ;Removes ban on Nick from channel #test /ban -r #test Nick ;Bans all users from host.com /ban #test *!*@host.com