Hooking Server Numerics                                                     

In addition to the numerous named hooks provided by the client (refer to the
ON command in Section 5), BitchX and EPIC can hook any numeric reply sent 
by a server. They are treated no differently from named hooks.  Space 
constraints prevent a full discussion of all server numerics, not to mention 
that they tend to differ from network to network.

A small subset of commonly used numerics are provided for convenience.  A
mostly full listing can be found in the irc protocol specification, RFC 1459
(though you should look in the ircd source code for an exact list; they are
in the file s_err.c in standard ircd distributions).

   Replies to /whois:   311-313, 317-319
   Replies to /mode +b: 367, 368
   Replies to /trace:   200-206, 208, 209, 261, 262
   Replies to /stats:   211-219, 241-244

   Common error numerics: 401 (nickname doesn't exist)
                        : 404 (can't send message to channel)
                        : 421 (unknown command)
                        : 436 (nickname collision server kill)
                        : 465 (you're banned from server)
                        : 473 (can't going channel, invite-only)
                        : 482 (you're not a channel operator)

