@SYNTAX:whois@

Shows whois information of the specified nick.
By default, this is aliased to /WI.

/WHOIS nick1 nick1 also queries the idle time of
the user. This is aliased to /WII by default.

If given nick is not in the IRC, irssi automatically
sends a WHOWAS query. Read carefully the reply to see
if it is a WHOIS or WHOWAS reply. :)

See also: WHO, CHANNEL