This page lists the tags, capabilities, commands, batches and metadata keys that have been defined by the IRCv3 Working Group, are described by our specifications, or that we otherwise recommend using. Draft-status names are listed without the draft/, as this primarily catalogues reserved names.

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Numerics 🔗

Numeric	Name	Specs	Description
005	RPL_ISUPPORT		Lists features supported by the server; sent as connection registration is completed. (1) (2) (3)
335	RPL_WHOISBOT	Bot Mode	Indicates that the client being WHOIS‘d is a bot
354	RPL_WHOSPCRPL	WHOX	Not defined by IRCv3 but extended to allow servers to send more information.
670	RPL_STARTTLS	starttls [deprecated]	Indicates that the client may begin their TLS handshake
691	ERR_STARTTLS	starttls [deprecated]	Indicates that STARTTLS failed because of an unspecified error
730	RPL_MONONLINE	Monitor	Indicates to a client that either a target has just become online, or that a target they have added to their monitor list is online
731	RPL_MONOFFLINE	Monitor	Indicates to a client that either a target has just left the irc network, or that a target they have added to their monitor list is offline
732	RPL_MONLIST	Monitor	Returns the list of targets that the client has in their monitor list
733	RPL_ENDOFMONLIST	Monitor	Indicates the end of a monitor list
734	ERR_MONLISTFULL	Monitor	Indicates to a client that their monitor list is full
900	RPL_LOGGEDIN	SASL v3.1, SASL v3.2	Indicates that the client is logged in
901	RPL_LOGGEDOUT	SASL v3.1, SASL v3.2	Indicates that the client has been logged out
902	ERR_NICKLOCKED	SASL v3.1, SASL v3.2	Indicates that SASL auth failed because the account is currently locked out, held, or otherwise administratively made unavailable
903	RPL_SASLSUCCESS	SASL v3.1, SASL v3.2	Indicates that SASL auth finished successfully
904	ERR_SASLFAIL	SASL v3.1, SASL v3.2	Indicates that SASL auth failed because of invalid credentials or other errors not explicitly mentioned by other numerics
905	ERR_SASLTOOLONG	SASL v3.1, SASL v3.2	Indicates that SASL auth failed because the client-sent AUTHENTICATE command was too long (i.e. the parameter was longer than 400 bytes)
906	ERR_SASLABORTED	SASL v3.1, SASL v3.2	Indicates that SASL auth has been aborted because the client sent an AUTHENTICATE command with * as the parameter
907	ERR_SASLALREADY	SASL v3.1, SASL v3.2	Indicates that SASL auth failed because the client has already authenticated and the server doesn’t support re-authenticating
908	RPL_SASLMECHS	SASL v3.1, SASL v3.2	Sends the SASL mechanisms supported by the server, in response to an incorrectly-sent AUTHENTICATE message

Capabilities 🔗

Name	Specs	Description
account-notify	account-notify	Notifies clients when other clients in common channels authenticate with or deauthenticate from their account (e.g. NickServ, SASL).
account-registration	account-registration [draft]	Indicates support for the REGISTER/VERIFY commands, a standardised way for clients to register accounts.
account-tag	account-tag	Attaches a tag containing the user’s account to every message they send.
away-notify	away-notify	Notifies clients when other clients in common channels go away or come back.
batch	batch	Lets the server bundle common messages together, which lets clients be more intelligent about displaying them.
cap-notify		Notifies clients when client capabilities become available or are no longer available.
channel-rename	channel-rename [draft]	Enables renaming a channel without closing it down and redirecting to a new one.
chathistory	chathistory [draft]	Lets clients request chat history from servers or bouncers.
chghost	chghost	Enables the CHGHOST message, which lets servers notify clients when another client’s username and/or hostname changes.
echo-message	echo-message	Notifies clients when their PRIVMSG and NOTICEs are correctly received by the server.
event-playback	chathistory [draft]	Lets clients request JOIN/MODE/etc messages as part of history.
extended-join	extended-join	Extends the JOIN message to include the account name of the joining client.
extended-monitor	extended-monitor	Extends the MONITOR spec to apply to more events.
invite-notify	invite-notify	Notifies clients when other clients are invited to common channels.
labeled-response		Allows clients to correlate requests with server responses
message-tags	message-tags	Allows clients and servers to use tags more broadly
metadata		Lets clients store metadata about themselves with the server, for other clients to request and retrieve later.
monitor	Monitor	Lets users request notifications for when clients become online / offline.
multi-prefix	multi-prefix	Makes the server send all prefixes in NAMES and WHO output, in order of rank from highest to lowest.
multiline	multiline [draft]	Allows clients and servers to use send messages that can exceed the usual byte length limit and that can contain line breaks.
no-implicit-names	no-implicit-names [draft]	Disables implicit NAMES responses on JOIN.
pre-away	pre-away [draft]	Allows clients to send AWAY commands during connection registration.
read-marker	read-marker [draft]	Allows clients of the same user to synchronize read markers.
sasl	SASL v3.1, SASL v3.2	Indicates support for SASL auth, a standardised way for clients to identify for an account.
server-time	server-time	Lets clients show the actual time messages were received by the server.
setname	setname	Lets clients change their realname after connecting to the server.
standard-replies	standard-replies	Allows servers to use standard replies more broadly
tls	starttls [deprecated]	Indicates support for the STARTTLS command, which lets clients upgrade their connection to use TLS encryption.
userhost-in-names	userhost-in-names	Extends the RPL_NAMREPLY message to contain the full nickmask (nick!user@host) of every user, rather than just the nickname.

Tags 🔗

Name	Specs	Description
account	account-tag	Contains the account name of the user that sent the attached message to the client.
batch	batch	Contains the ID of the batch the attached message is a part of.
bot	Bot Mode	Indicates this message was sent by a bot.
label		Allows clients to correlate requests with server responses
msgid	msgid	Provides a server supplied unique message ID
multiline-concat	multiline [draft]	Indicates that a message is to be concatenated directly (without a line break) with the previous message in a multiline message batch.
time	server-time	Contains the time that the given message should be treated as happening at.
+react	+react [draft]	Sends a reaction to a specific sent message.
+reply	+reply [draft]	Marks that a given message is intended as a reply to a specific sent message.
+typing	+typing	Allows users to see when other users are typing.
+channel-context	+channel-context [draft]	Indicates the channel a private message should be displayed in.

Batches 🔗

Name	Specs	Description
chathistory		Indicates that the given messages represent history playback from this channel.
labeled-response		Allows clients to correlate requests with server responses
multiline	multiline [draft]	Indicates that the given messages are part of a multiline message.
netjoin		Indicates that the given clients are joining as the result of a netjoin (two split servers reconnecting).
netsplit		Indicates that the given clients are quitting as the result of a netsplit (two servers disconnecting).

Messages 🔗

Name	Specs	Description
AUTHENTICATE	SASL v3.1, SASL v3.2	Used to login to a client account when SASL authentication is negotiated.
ACCOUNT	account-notify	Notifies clients of new logins by friends.
CAP		Lets clients negotiate client capabilities with servers.
CHATHISTORY	chathistory [draft]	Lets clients request chat history from servers or bouncers.
CHGHOST	chghost	Notifies clients of changed usernames and hostnames of friends
INVITE	invite-notify	Not defined by IRCv3 but extended to alert other clients that someone’s been invited to one of their channels.
JOIN	extended-join	Not defined by IRCv3 but extended to include usernames and hostnames.
METADATA		Lets clients store metadata about themselves with the server, for other clients to request and retrieve later.
MONITOR	Monitor	Existing command which allows clients to see when specific nicknames enter or leave the network.
NAMES	userhost-in-names	Not defined by IRCv3 but extended to include account names.
MARKREAD	read-marker [draft]	Fetches or stores a read marker.
REGISTER	account-registration [draft]	Lets clients register user accounts.
RENAME	channel-rename [draft]	Enables renaming a channel without closing it down and redirecting to a new one.
STARTTLS	starttls [deprecated]	Allows clients to upgrade their plaintext connections to use TLS encryption.
TAGMSG	message-tags	Lets clients send messages with tags but no text content.
VERIFY	account-registration [draft]	Lets clients verify their newly-registered accounts.
WEBIRC	WebIRC	Existing command which provides the real IP address of clients to the server when connecting through a gateway.
WHO	WHOX	Not defined by IRCv3 but extended to allow clients to request more information.

RPL_ISUPPORT 🔗

Name	Specs	Description
BOT	Bot Mode	Indicates that clients can mark themselves as bots by setting a mode on themselves.
CLIENTTAGDENY	message-tags	Indicates client-only tags that are blocked or allowed by a server.
MONITOR	Monitor	Indicates the server supports the MONITOR command.
MSGREFTYPES	chathistory [draft]
UTF8ONLY	UTF8ONLY	Indicates the server only accepts UTF-8 encoded messages.
WHOX	WHOX	Indicates the server supports the extended WHO syntax

User Metadata 🔗

Key	Format	Description
avatar	URL with an optional {size} substitution denoting the size to load in pixels https://example.com/avatar/16/asdf.jpg	Avatar that graphical clients can show alongside the user’s name
bot	Any string PacketBot v1.2 JitiBot melo3	Lets bot runners provide the name of their bot software. Setting this key identifies the client as a bot.
color	HTML-style 6 hexadecimal digits #800040 #0a00ff	A color to associate with a user. Client designers may decide which UI elements use this color (for example avatar placeholders, nicknames or whole messages).
display-name	Any string James Wheare Posiden ダニエル Борис	Alternative name to use instead of a nick for display purposes. Useful for gateways to chat services that allow spaces and other characters in nicks. A nick is required for standard protocol level stuff but can be less prominent in the UI. May contain emoji.
homepage	Valid URL https://example.com/bot-info.html	URL of a webpage that contains more information about the user/bot themselves, or bot software in use.
status	Any string Working from home	Status text that can be shown for users without making them ‘away’

FAIL codes [spec] 🔗

Command	Code	Specs	Description
	ACCOUNT_REQUIRED	account-registration [draft]	Indicates that the client’s connection cannot proceed for lack of SASL authentication
	INVALID_UTF8	UTF8ONLY	Indicates that the client’s message was dropped because it contained non-UTF-8 bytes
BATCH	MULTILINE_MAX_BYTES	multiline [draft]	Indicates that the max-bytes multiline limit is exceeded
BATCH	MULTILINE_MAX_LINES	multiline [draft]	Indicates that the max-lines multiline limit is exceeded
BATCH	MULTILINE_INVALID_TARGET	multiline [draft]	Indicates a mismatched PRIVMSG target within a multiline batch
BATCH	MULTILINE_INVALID	multiline [draft]	Any other multiline error
BRB	CANNOT_BRB		Indicates that the BRB attempt was unsuccessful
CHATHISTORY	INVALID_PARAMS	chathistory [draft]	Indicates that the client sent invalid parameters with their CHATHISTORY command
CHATHISTORY	INVALID_TARGET	chathistory [draft]	Indicates that the client attempted to request CHATHISTORY from a channel or conversation that does not exist, or that they are not authorized to view
CHATHISTORY	MESSAGE_ERROR	chathistory [draft]	Indicates that CHATHISTORY content could not be retrieved due to a server error
CHATHISTORY	NEED_MORE_PARAMS	chathistory [draft]	Indicates that the client sent insufficient parameters with their CHATHISTORY command
CHATHISTORY	UNKNOWN_COMMAND	chathistory [draft]	Indicates that the client sent an invalid subcommand of CHATHISTORY
JOIN	CHANNEL_RENAMED	channel-rename [draft]	Indicates a joined channel has been renamed
REGISTER	ACCOUNT_EXISTS	account-registration [draft]	Indicates that the desired account name (the user’s nick) has already been registered.
REGISTER	ACCOUNT_NAME_MUST_BE_NICK	account-registration [draft]	Indicates that the desired account name does not match the user’s current nick, when it must match.
REGISTER	ALREADY_AUTHENTICATED	account-registration [draft]	Indicates that the client is already authenticated.
REGISTER	BAD_ACCOUNT_NAME	account-registration [draft]	Indicates that the desired account name is invalid or otherwise restricted/disallowed.
REGISTER	COMPLETE_CONNECTION_REQUIRED	account-registration [draft]	Indicates that the client can only use REGISTER once they are fully connected.
REGISTER	INVALID_EMAIL	account-registration [draft]	Indicates that the server cannot send emails to the given email address.
REGISTER	NEED_NICK	account-registration [draft]	Indicates that the REGISTER command has been sent before sending a NICK command when using the before-connect key.
REGISTER	TEMPORARILY_UNAVAILABLE	account-registration [draft]	Indicates that the REGISTER command is temporarily unavailable.
REGISTER	UNACCEPTABLE_EMAIL	account-registration [draft]	Indicates that the email address cannot be used for account registration.
REGISTER	UNACCEPTABLE_PASSWORD	account-registration [draft]	Indicates that the desired password is invalid for any reason other than weakness.
REGISTER	WEAK_PASSWORD	account-registration [draft]	Indicates that the desired password is too weak.
RENAME	CHANNEL_NAME_IN_USE	channel-rename [draft]	Indicates that a channel name is already taken
RENAME	CANNOT_RENAME	channel-rename [draft]	Indicates any other channel renaming failure
RESUME	CANNOT_RESUME		Indicates that the resume attempt was otherwise unsuccessful
RESUME	INSECURE_SESSION		Indicates that either the old or new session was not connected securely
RESUME	INVALID_TOKEN		Indicates that the provided resume token was not correct
RESUME	REGISTRATION_IS_COMPLETED		Indicates that resume failed because connection registration has already completed
SETNAME	CANNOT_CHANGE_REALNAME	setname	Indicates that the realname could not be otherwise changed
SETNAME	INVALID_REALNAME	setname	Indicates that the new realname was invalid
VERIFY	ALREADY_AUTHENTICATED	account-registration [draft]	Indicates that the client is already authenticated.
VERIFY	INVALID_CODE	account-registration [draft]	Indicates that the code used by the VERIFY command is invalid or expired.
VERIFY	COMPLETE_CONNECTION_REQUIRED	account-registration [draft]	Indicates that the client can only use VERIFY once they are fully connected.
VERIFY	TEMPORARILY_UNAVAILABLE	account-registration [draft]	Indicates that the VERIFY command is temporarily unavailable.

WARN codes [spec] 🔗

Command	Code	Specs	Description
	INVALID_UTF8	UTF8ONLY	Indicates that the client’s message was modified because it contained non-UTF-8 bytes