These are the modes that grant a certain 'level' to a user.
|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.
These are so called 'list modes'.
|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).
These are channel modes that configure channel settings.
|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|
|d||chanmodes/delayjoin||When unsetting +D, Unreal needs to process all remaining delayed users (i.e. invisible in the channel to regular users) to make them JOIN. +d is an intermediate/temporary mode to facilitate this and will be unset once all users are properly "joined".||Set by server|
|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 +o 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.
In addition to that, in UnrealIRCd 5 all channel settings (modes, bans, topic, etc.) are saved in a database and restored on startup via the channeldb module.
|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|