MODE <channel> <+|-><modes> [parameters]
+? designates that the cmode is provided by an extension
+and may not be present on this server.
+
CHANNELMODE - DESCRIPTION
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NO PARAMETERS:
+s - Secret. Channel will not be shown in /whois and /list etc.
+p - Private. Disables /knock to the channel.
+m - Moderated. Only opped/voiced users may talk in channel.
- +i - Invite only. Users need to be /invite'd or match a +I to
+ +i - Invite only. Users need to be invited or match a +I to
join the channel.
+r - Registered users only. Only users identified to services
may join.
- +c - No color. All color codes in messages are stripped.
+ +c - No color. All markup (color, bold, underline, etc.) in
+ messages is stripped.
+g - Free invite. Everyone may invite users. Significantly
weakens +i control.
+ ? +u - Unfiltered. Receive messages that would otherwise be filtered
+ server side based on content.
+z - Op moderated. Messages blocked by +m, +b and +q are instead
sent to ops.
+L - Large ban list. Increase maximum number of +beIq entries.
ops are necessary).
+Q - Disable forward. Users cannot be forwarded to the channel
(however, new forwards can still be set subject to +F).
+ +C - Disable CTCP. All CTCP messages to the channel, except ACTION,
+ are disallowed.
+ ? +O - IRC Operator only channel.
+ ? +A - IRC server administrator only channel.
+ ? +T - No NOTICEs allowed in the channel.
+ ? +S - Only users connected via SSL/TLS may join the channel while this
+ mode is set. Users already in the channel are not affected.
WITH PARAMETERS:
+f - Forward. Forwards users who cannot join because of +i,