Channel Modes

Example

To set +c on the channel #moo:

/mode #moo +c

To unset it:

/mode #moo -c

Channel Modes

Flag	Title	Description
c	No control codes	Prevent all users from sending colored, underlined and bold text.
n	No external messages	Prevent any user from using /msg #channel if they're not in the channel themselves.
t	Ops topic	Prevent any user who does not have halfop or higher to set channel topics.
s	Secret	Make the channel completely secret to anyone (except server admins). With this mode set, the channel will not be shown in /whois or /list.
p	Private	Make channel private, hiding it in users' whois and replacing it with * in /LIST.
m	Moderated	Prevent any user without voice (+v) or higher from talking in the channel.
i	Invite only	Prevent anyone from joining the channel unless they have received an invitation from someone inside with /invite nick. If a user matches the +I list, they are able to join the channel without being invited.
B	Censorship	Blocks words sent to channel set by the server, changing certain words to (censored). See: Censorship list
B	Block Caps	Blocks messages with too many capital letters, as determined by the network configuration
C	No CTCPs	Prevent any user from sending CTCPs to the channel. Exception: CTCP ACTION (/me) is still permitted.
M	Mute unregistered	Prevent any user from talking in the channel if they haven't identified to their nick through NickServ.
T	No notices	Prevent users from sending channel notices through /notice
R	Registered only	Prevent anyone from joining the channel if they haven't identified to NickServ.
z	SSL only	Prevent anyone from joining the channel unless they are connected via SSL.
S	Strip Colors	Strips all colored, underlined and bold text from the message being sent to the channel, but still lets the message page.
O	Oper only	Only IRC Operators may set this mode. Prevent users from joining the channel unless they are an IRC Operator.
N	No nick changes	Prevents any user without voice or higher from changing their nickname.
Q	Restricted Kick	Only U:Lined servers and their users can kick. (i.e. services only)

Channel Modes Involving a Parameter

Flag	Title	Description
k	Key	This is what most would refer as a 'channel password'. It'll prevent users without the channel key to join it. If you have the password, you can join it with /join #channel key. To set this mode: /mode #channel +k key
l	Limit	If you have this set to a certain number, people will not be able to join the channel if the user count reach the LIMIT. /mode #channel +l limit.
v	Voice	By giving this user mode to someone, you will allow them to talk if the channel is muted through CMODE +m. /mode #channel +vvvv nick1 nick2 nick3 nick4
h	Half-op	This will allow a user to set most of the channel modes and they will be able to kick users who have voice (+v) or nothing in the channel. However, they are unable to kick each other if CMODE +p is set. Half-ops are unable to kick +o users (and higher) regardless of channel modes. /mode #channel +hhhh nick1 nick2 nick3 nick4
o	Op	This gives the user control over half-opped, voiced, and regular users. An opped user may op other users, set any mode except +q and +a, and remove ops from whoever they want. Opped users cannot perform actions against owners, or protected users. /mode #channel +oooo nick1 nick2 nick3 nick4
a	Protected/Admin	This gives the user control over opped, half-opped, voiced, and regular users. A protected/admin user may op other users, set any mode except +q and +a, and remove ops from whoever they want. Protected/admin users cannot perform actions against owners or other protected users. /mode #channel +aaaa nick1 nick2 nick3 nick4
q	Owner	This gives the user full control over the channel. A owner may owner/protect/op other users, set any mode, and remove owner/protect/ops from whoever they want. /mode #channel +qqqq nick1 nick2 nick3 nick4
b	Ban	This will prevent a user from entering the channel, based on a nick!ident@host match. Alternatively, if the user is already in the channel, this mode will mute them if they have no status. /mode #channel +b nick!ident@host Examples: /mode #moo +b Romney!*@* will ban all users using the nick Romney. /mode #moo +b *!*@*.aol.com will ban all of AOL users.
g	Word Block	This is similar to +G, but in this case the word block is channel specific instead of server based. It will block the message sent entirely if the word blocked by this mode is used. /mode #channel +g *fuck* To view a channels +g block list, /mode #channel +g
e	Exempt	This will allow a user to join a channel even if they are banned (+b), based on a nick!ident@host match. /mode #channel +eee nick1!ident1@host1 nick2!ident2@host2 nick3!ident3@host3 Examples: /mode #moo +e Jacob!*@* will allow 'Jacob' to join the channel even if he is banned or the channel is set to +i. /mode #moo +e *!*@*.com will allow anyone connecting through a host ending on .com to join the channel for the same reasons as Jacob.
I	Invite Exempt	This will allow a user to join an invite-only (+i) channel, based on a nick!user@host match. /mode #channel +IIII nick1!ident1@host1 nick2!ident2@host2 nick3!ident3@host3 nick4!ident4@host4

See also

• Channel Management