Mode

Used for setting channel and user modes.

/mode <nick|#channel> [+-modes]

If you're setting user modes you will have to specify your own nick. You cannot change user modes for other users. Neither can you view another user's usermodes using /mode. Channel modes can only set by a channel operator. However you can view the current channel modes even if you're not a channel op.

Depending on the network you're using there might be different channel and user modes. Here is a list of channel modes which are available on QuakeNet:

Mode	Meaning
+b	Ban (Parameter: a hostmask)
+k	Channel key (Parameter: the key for your channel)
+l	Channel limit (Parameter: the new limit)
+i	Invite only (users need to be invited using /invite before they can join your channel)
+m	Moderated (only ops and voices can speak in the channel)
+n	No external messages (only users who are on the channel can speak)
+p	Private (this channel mode is deprecated, use +s instead)
+s	Secret (channel will not be shown in /list or /whois)
+t	Only ops can set the topic
+r	Only registered users can join the channel (see the Q faq for more details)
+D	Auditorium mode (user are invisible until they say something or change the topic/modes)
+d	This is set by the server if you remove chanmode +D and there are still invisible users
+c	No colors/bold is allowed in channel messages
+C	No channel CTCPs
+N	No channel notices
+u	Hide part/quit reasons

The following user modes are available to (ordinary) users:

Mode	Meaning
+i	Invisible (you're not visible in /who requests)
+w	Receive walluser messages.
+R	Receive messages/notices from registered users only
+x	Hides your host (you need to be registered for this to work)