Channel modes

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Access levels

These are the modes that grant a certain 'level' to a user.

Channel mode Module Description Restrictions
v built-in Voice. This makes the user able to speak in +m/+M channels. User can also still speak if banned. May be set by +hoaq users
h built-in Half-Op. Gives some of the usual channel operator rights, but not all. They are basically a light version of channel ops. May be set by +oaq users
o built-in Channel Op. This is the channel operator privilege everyone knows about, allows the user to do almost all administrative tasks in a channel such as /KICK, /MODE, etc.. May be set by +oaq users
a built-in Channel Admin. A level above channel ops but with no special extra privileges except for one: people below chanadmin (so +h/+o) cannot KICK +a people. May be set by +q users
q built-in Channel Owner. The highest level. Channel owners can't be kicked by any level below. Usually there's only one person with +q and the mode is set by services. Normal users can't set this

Note that often Services are used to manage +vhoaq lists in so called "access lists" or AOP/HOP/etc. Consult your services documentation.

IRCOp's with OperOverride privileges may also set +vhoaq, same for IRCOp's with access to the /SAMODE command.

List modes

These are so called 'list modes'.

Channel mode Module Description Restrictions
b built-in Ban. Prevents a user from joining the channel. Requires +h or higher
e built-in Ban exception. When a user is banned (due to +b) and they are on this +e list then they may still join the channel. Requires +h or higher
I built-in Invite exception. When the channel is +i (invite only) then people on this list may still join the channel. Requires +h or higher

All these modes take a nick!user@host parameter, like: +b *!*@*.isp.com. See also Extended bans for other syntaxes (eg: +e ~c:@#channel).

Channel settings

These are channel modes that configure channel settings.

Channel mode Module Description Restrictions
c chanmodes/nocolor No color allowed in the channel. Will block ANSI and mIRC color codes. Requires +o or higher
C chanmodes/noctcp No CTCP's allowed in the channel. Requires +o or higher
D chanmodes/delayjoin Delays someone's JOIN message until that person speaks. Chanops and higher, opers and ulines/services are exempt. Requires +o or higher
f chanmodes/floodprot Flood protection. This is a highly advanced feature, see Anti-flood features#Channel_mode_f Requires +o or higher
G chanmodes/censor Filter out bad words configured in Badword block Requires +o or higher
i built-in Invite only. Requires people to be /INVITE'd to the channel or be on the +I (Invite Exceptions) list (for that latter, see the List modes section above) Requires +o or higher
k built-in Require users to specify a channel key in order to join (/JOIN #chan key). Example: +k secret Requires +h or higher
K chanmodes/noknock /KNOCK command is not allowed. Requires +o or higher
L built-in Channel link. If the +l user limit (see below) is reached then users will automatically be redirected to this channel. Example: +L #something Requires +h or higher
l built-in Limit the amount of users that may be in the channel. If the limit is reached then any new JOIN's are rejected (see also +L above). Requires +o or higher
m built-in Moderated channel. Only people with +v or higher (+vhoaq) may speak. Requires +h or higher
M chanmodes/regonlyspeak Must be authenticated to services or have +v or higher to speak. Requires +o or higher
N chanmodes/nonickchange No nick-changes permitted. Normally not set, only during a a nick-flood flood attack. Requires +o or higher
n built-in No external messages. If you don't set +n then users outside the channel may still send messages to it. Thus, almost everyone will set their channel +n. Requires +h or higher
O chanmodes/operonly IRC Operator only channel IRCOp-only
P chanmodes/permanent Permanent channel. After all users leave a channel it is normally destroyed. If you set +P then this won't happen and all settings are preserved. IRCOp-only
p built-in Private channel Requires +o or higher
Q chanmodes/nokick No /KICK allowed. Can be used to force all chanops to use Services for kicking. Unusual, but possible. Requires +o or higher
R chanmodes/regonly Only registered users may join the channel. Registered users are users authenticated to Services. Requires +o or higher
r built-in Channel is registered at Services Set by services
s built-in Secret channel. The channel won't show up in /LIST and won't show up in /WHOIS (unless you are in the same channel or an IRCOp) Requires +o or higher
S chanmodes/stripcolor Strip color codes. This removes any mIRC or ANSI color codes by converting it to regular text. Requires +o or higher
T chanmodes/nonotice Channel notices are not permitted (/NOTICE #chan hi!). On many clients a beeping sound will happen on notices, hence why this mode is sometimes set. Requires +o or higher
t built-in Restricts /TOPIC to +h or higher. Without +t anyone in the channel may set the topic. Most channels are +t. Requires +h or higher
V chanmodes/noinvite /INVITE is not permitted. Requires +o or higher
z chanmodes/secureonly Only clients which are connected through SSL/TLS may join the channel Requires +o or higher
Z chanmodes/issecure Indicates that only people who are using SSL/TLS are on the channel. This channel mode is (only) set by the server when the channel is also +z and everyone on the channel is connected via SSL. Set by server