| /mode | User / Channel | IRCd | Description | Set By |
|---|
| A | User | Ultimate, Unreal | Server Administrator. Marks the user as a server administrator. | IRCd |
| A | Channel | Ultimate, Unreal | Administrators Only. Unknown. | Unknown |
| a | User | Hybrid | Server Administrator. Marks the user as a server administrator. | IRCd |
| a | User | Ultimate | Services Operator. Marks the user as a services operator. | IRCd, Services |
| a | User | Unreal | Services Administrator. Marks the user as a services administrator. | IRCd, Services |
| a | Channel | Hybrid | Hide Operators. Unknown. | Unknown |
| a <nickname> | Channel | Unreal | Channel Administrator. Prevents users except administrators and owners from kicking him or her. | Owner |
| B | User | Ultimate | Server Bot. Marks the user as a server bot in /whois. | Unknown |
| B | User | Unreal | Bot. Marks the user as a bot in /whois. | Anyone |
| b | User | Hybrid | Bots. Unknown. | Unknown |
| b | User | Ultimate | Bot. Marks the user as a bot in /whois. | Anyone |
| b <hostmask> | Channel | All | Ban. Prevents users matching the hostmask from joining the channel. | ChanOps |
| C | User | Ultimate | Chat Operator. Allows the IRC operator to send and receive /chatops commands. | IRCops |
| C | User | Unreal | Co-Administrator. Unknown. | IRCd |
| C | Channel | Unreal | CTCP Block. Block CTCPs from being sent to the channel. | ChanOps |
| c | User | Hybrid, Ultimate, Unreal | Connection Notices. Allows the IRC operator to receive a notice for each client that connects or disconnects from the local server. | IRCops |
| c | Channel | Unreal | Colour Block. Rejects any lines that contain colour codes. | ChanOps |
| d | User | Hybrid | Debug. Shows debugging messages. | Unknown |
| d | User | IRCu, Ultimate, Unreal | Deaf. Prevents the server from sending the user any channel text. | Anyone |
| e | User | Ultimate | Edit Configuration. Allows the IRC operator to edit the configuration file from IRC. | Unknown |
| e <hostmask> | Channel | Hybrid, IRCnet, Ultimate, Unreal | Exemption. Allows users that match the hostmask to join the channel even if he or she is banned. | ChanOps |
| F | User | Ultimate | Global Connection Notices. Allows the IRC operator to receive a notice for each client that connects or disconnects from the network. | IRCops |
| f | User | Hybrid | Full. Show full I:line notices. | Unknown |
| f | User | Ultimate, Unreal | Flood Notices. Allows the IRC operator to receive a notice every time someone quits the local server due to excess flood. | IRCops |
| f [*]<lines>:<seconds> | Channel | Ultimate, Unreal | Flood. Specifies that the server should kick users that say more than so many lines in so many seconds from the channel. Using the optional asterisk means that the user should be banned in addition to kicked. | ChanOps |
| G | User | Ultimate | Network Globals. Allows the irc operator to see and use /globops. | IRCops |
| G | User | Unreal | G-Filter. Censors swear words that are sent to the user in the channel or elsewhere. | Anyone |
| G | Channel | Unreal | G-Rated. Censors swear words that are said in the channel. | ChanOps |
| g | User | Hybrid | Caller ID. Unknown. | Unknown |
| g | User | Ultimate | Global Notices. Allows the user to see global notices. IRC operators see more global notices than regular users. | Anyone |
| g | User | Unreal | Network Globals. Allows the irc operator to see and use /globops and /chatops. | IRCops |
| H | User | Unreal | Hide IRC Operator Status. Hides the IRC operator line in /whois. | IRCops |
| h | User | Ultimate, Unreal | Help Operator. Marks the user as available to help users. Depending on the IRCd, also allows the operator to see /helpop notices. | IRCops |
| h <nickname> | Channel | Hybrid, Ultimate, Unreal | Half Operator. Marks the user as a half channel operator. | ChanOps |
| I | User | Ultimate | IRC Administrator. Unknown. | Unknown |
| I | Channel | Ultimate | Invitation Block. Prevents users from inviting anyone into the channel. | ChanOps |
| I <hostmask> | Channel | Hybrid, IRCnet | Invitation. Allows any user that matches the hostmask to join the channel without an invitation. | ChanOps |
| i | User | All | Invisible. Prevents the user from showing up in /names and /who output. | Anyone |
| i | Channel | All | Invitation Only. Prevents anyone from joining the channel without an invitation. | ChanOps |
| K | Channel | Ultimate, Unreal | Knock Block. Prevents users from using /knock on the channel. | ChanOps |
| k | User | Hybrid, Ultimate, Unreal | Kill Notices. Allows the user to see when a user is killed from the local server. | Anyone |
| k <key> | Channel | All | Keyed. Prevents everyone who does not know the key (password) from joining the channel. | ChanOps |
| L <channel> | Channel | Ultimate, Unreal | Overflow. Specifies which channel users should be sent to when the channel reaches its limit (+l). | ChanOps |
| l | User | Hybrid | Locops. Unknown. | Unknown |
| l <users> | Channel | All | Limit. Restricts the size of the channel. After so many users are in the channel, no more can join until one leaves. | ChanOps |
| M | User | Ultimate | See Hiddent Channels. Allows the IRC operator to see all modes, and +p and +s channels, in /list. | IRCops |
| M | Channel | Unreal | Moderate Unregistered Users. Doesn't allow unregistered users (-r) to talk in the channel. | ChanOps |
| m | User | Ultimate | Whois Notification. Allows the IRC operator to see when users /whois him or her. | IRCop |
| m | Channel | All | Moderated. Marks the channel as moderated. Members of the channel who do not have channel privilege (+v, +h, +o, etc) can not speak in the channel. | ChanOps |
| N | User | Ultimate, Unreal | Network Administrator. Prevents the user from being killed by anyone except services and protected (+p) users. | Services |
| N | Channel | Unreal | Nickname Block. Prevents users in the channel from changing nicknames. | ChanOps |
| n | User | Hybrid | Nickname Notice. Shows the user a notice every time a user changes nicknames. | IRCops |
| n | Channel | All | No External Messages. Prevents users who have not joined the channel from talking in it without joining, first. | ChanOps |
| O | User | Ultimate, Unreal | Local IRC Operator. Marks the user as a local IRC operator. | IRCd |
| O | Channel | Ultimate, Unreal | Operators Only. Only allows IRC operators to join the channel. | IRCops |
| o | User | All | Global IRC Operator. Marks the user as a global IRCop | IRCd |
| o <nickname> | Channel | All | Operator. Marks the user as a channel operator. | ChanOps |
| P | User | Ultimate | Services Administrator. Marks the user as a services administrator. | IRCd, Services |
| p | User | Ultimate | Protected. Blocks users from kicking, deoping, dehalfoping, devoicing, and killing the user. | Services |
| p | User | Unreal | Hidden Channels. Hides the channels from the user's /whois. | Unknown |
| p | Channel | All | Private. Hides the channel from /whois. | ChanOps |
| Q | Channel | Unreal | Kick Block. Only allows services to kick users from the channel. | Unknown |
| q | User | Unreal | Kick Block. Only allows services to kick you from a channel. | IRCops |
| q <nickname> | Channel | Unreal | Owner. Marks the user as channel owner. | Services |
| R | User | Ultimate | Restricted. Blocks user from becoming a channel operator or changing nicknames. | IRCd |
| R | User | Unreal | Registered Messages Only. Blocks messages and notices from unregistered (-r) users. | Anyone |
| R | Channel | Bahamut, Ultimate, Unreal | Registered Users Only. Prevents users who have not identified with services from joining the channel. | ChanOps |
| r | User | Hybrid | Rejected Notice. Shows rejected client notices. | Unknown |
| r | User | Bahamut, IRCu, Ultimate, Unreal | Registered. Marks the user as having identified with services. | Services |
| r | User | Unknown | Restricted. Blocks user from becoming a channel operator or changing nicknames. | IRCd |
| r | Channel | Bahamut, Ultimate, Unreal | Registered. Marks the channel as registered with services. | Services |
| r | Channel | IRCu | Registered Users Only. Prevents users who have not identified with services from joining the channel. | ChanOps |
| S | User | Ultimate, Unreal | Services Client. Prevents the user from being kicked, deoped, dehalfoped, devoiced, ans killed. Also hides the channel list from /whois. | Services |
| S | Channel | Ultimate, Unreal | Strip Colours. Strips colours from text in the channel. | ChanOps |
| s | User | Hybrid, Ultimate, Unreal | Server Notices. Allows the user to see local server notices. | Anyone |
| s | Channel | All | Secret. Hides the channel from /whois and /list. | ChanOps |
| T | User | Ultimate | Technical Administrator. Unknown. | Unknown |
| T | User | Unreal | CTCP Block. Blocks CTCPs from getting to the user. | Anyone |
| T | Channel | Unreal | Notice Block. Doesn't allow users to send notices to the channel. | ChanOps |
| t | User | Unreal | V-Host. Signifies that the user is using a /vhost. | IRCd |
| t | Channel | All | Only Operators Set Topic. Prevents users who are not channel operators from changing the channel topic. | ChanOps |
| u | User | Hybrid | Unauthorized Notices. Shows unauthorized client notices. | Unknown |
| u | Channel | Unreal | Auditorium. Makes /names and /who only show channel operators to regular users, and show everyone to channel operators. | ChanOps |
| V | User | Unreal | WebTV. Marks the user as a WebTV user. | Unknown |
| V | Channel | Unreal | Invitation Block. Prevents users from inviting anyone into the channel. | ChanOps |
| v | User | Unreal | Infected DCC Notices. Unknown. | Unknown |
| v | Channel | All | Voice. Allows the user to speak in a moderated channel. | ChanOps |
| W | User | Ultimate | Watcher Notices. Unknown. | Unknown |
| W | User | Unreal | Whois Notification. Allows the IRC operator to see when users /whois him or her. | IRCop |
| w | User | All | Wallops. Lets the user view wallops when they are sent by IRC operators. This is restricted to server wallops in Hybrid | Anyone |
| X | User | Ultimate | Network Monitor. Unknown. | Services |
| x | User | Hybrid | External Notices. Shows remote splits and server connection notices. | Unknown |
| x | User | IRCu, Ultimate, Unreal | Masked Hostname. Hides the user's hostname or IP address from other users. | Anyone |
| x | Channel | Ultimate | Colour Block. Rejects any lines that contain colour codes. | ChanOps |
| y | User | Hybrid | Spy Notices. Shows when users use /stats, /links, and /trace. | Unknown |
| Z | User | Ultimate | Network Co-Administrator. Unknown. | IRCd |
| z | User | Hybrid | Operator Wallops. Shows wallops that were sent by IRC operators. | Unknown |
| z | User | Ultimate | IRC Co-Administrator. Unknown. | IRCd |
| z | User | Unreal | Secure User. Marks the user as connected via SSL. | IRCd |
| z | Channel | Unreal | Secure Users Only. Only allows secure (SSL) users join. | ChanOps |