Server Commands/CHECK
CHECK <channel|nick|server|hostmask> [-flags]
Where valid flags are:
- -c: Show channels when checking a hostmask.
- -i: Show IPs instead of hostnames when displaying results.
- -o: Only show channel operators when checking a channel.
- -u: Hide users when checking a channel.
<hostmask> can be of the form host, user@host, nick!user@host, with host being host.domain.cc, 127.0.0.1 or 127.0.0.0/24. Wildcards are supported.
CHECK Returns extended information about the given nick/server/channel.