Someone

on *:TEXT:!bl*:#: {
  if ($nick isop $chan) || ($nick ishop $chan) {
    set %bl [ $+ [ $address($2,2) ] ]
    ban -k $chan $nick BLACKLISTED
}
}
on *:JOIN:#: {
if (%bl [ $+ [ $address($nick,2) ] ] == %bl [ $+ [ $address($nick,2) ] ]) {
ban -k $chan $Nick BLACKLISTED
}
}