WHOIS

Usage: /WHOIS [<server>] <nickmask>[,<nickmask>[,...]]

Returns information about the specified user or users, that you are
allowed to see.  If the optional <server> argument is specified, then
information aobut the user in relation to that specified server will be
given, i/e idle time.

EXAMPLES:

/WHOIS Phalanx
     Returns available information about user 'Phalanx'.

/WHOIS irc.bu.edu Phalanx
     Asks server 'irc.bu.edu' for information on user 'Phalanx