AKILL

Usage: AKILL <nick|user@host> <reason> [<time>]
This will place a kline on all servers that are connected to your server, thus preventing someone from logging into the entire network. You can use the nick for a user who is currently on the chat network and the network will akill that user's address. You must include a reason for the command to work.
Note: If a server is split off when the akill is placed, it will not be present on that system. To get a list of akills on your server do a /STATS k and look for the lines that are prefixed with A: instead of K:. See rakill and unakill to remove an akill. Akills must end with either text, or the time parameter. If no time parameter is given, the akill will be placed indefinitely.
Examples:
/akill Rachel flooding 30
/akill alumnus@nc-67-77-218-198.dyn.sprint-hsd.net spamming
An akill is a way of banning someone from the chat network. It is a last resort when warnings and kills did not keep the person from misbehaving. An akill works basically the same way that a channel ban works, except that it prevents someone from logging into the network rather than from just joining a channel.
See also: RAKILL