Red denotes a conflicting numeric definition, gray for depreciated (however quite possibly still in use), and blue for OK.

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# Name Origin Format Comments
001 RPL_WELCOME RFC2812 :Welcome to the Internet Relay Network <nick>!<user>@<host> The first message sent after client registration. The text used varies widely
002 RPL_YOURHOST RFC2812 :Your host is <servername>, running version <version> Part of the post-registration greeting. Text varies widely
003 RPL_CREATED RFC2812 :This server was created <date> Part of the post-registration greeting. Text varies widely
004 RPL_MYINFO RFC2812 <server_name> <version> <user_modes> <chan_modes> Part of the post-registration greeting
004 RPL_MYINFO KineIRCd <server_name> <version> <user_modes> <chan_modes> <channel_modes_with_params> <user_modes_with_params> <server_modes> <server_modes_with_params> Same as RFC2812 however with additional fields to avoid additional 005 burden.
005 RPL_BOUNCE RFC2812 :Try server <server_name>, port <port_number> Sent by the server to a user to suggest an alternative server, sometimes used when the connection is refused because the server is already full. Also known as RPL_SLINE (AustHex), and RPL_REDIR Also see #010.
005 RPL_ISUPPORT Also known as RPL_PROTOCTL (Bahamut, Unreal, Ultimate)
006 RPL_MAP Unreal
007 RPL_MAPEND Unreal
008 RPL_SNOMASK ircu Server notice mask (hex)
009 RPL_STATMEMTOT ircu
010 RPL_BOUNCE <hostname> <port> :<info> Sent to the client to redirect it to another server. Also known as RPL_REDIR
010 RPL_STATMEM ircu
014 RPL_YOURCOOKIE Hybrid?
015 RPL_MAP ircu
016 RPL_MAPMORE ircu
017 RPL_MAPEND ircu
042 RPL_YOURID IRCnet
043 RPL_SAVENICK IRCnet :<info> Sent to the client when their nickname was forced to change due to a collision
050 RPL_ATTEMPTINGJUNC aircd
051 RPL_ATTEMPTINGREROUTE aircd
200 RPL_TRACELINK RFC1459 Link <version>[.<debug_level>] <destination> <next_server> [V<protocol_version> <link_uptime_in_seconds> <backstream_sendq> <upstream_sendq>] See RFC
201 RPL_TRACECONNECTING RFC1459 Try. <class> <server> See RFC
202 RPL_TRACEHANDSHAKE RFC1459 H.S. <class> <server> See RFC
203 RPL_TRACEUNKNOWN RFC1459 ???? <class> [<connection_address>] See RFC
204 RPL_TRACEOPERATOR RFC1459 Oper <class> <nick> See RFC
205 RPL_TRACEUSER RFC1459 User <class> <nick> See RFC
206 RPL_TRACESERVER RFC1459 Serv <class> <int>S <int>C <server> <nick!user|*!*>@<host|server> [V<protocol_version>] See RFC
207 RPL_TRACESERVICE RFC2812 Service <class> <name> <type> <active_type> See RFC
208 RPL_TRACENEWTYPE RFC1459 <newtype> 0 <client_name> See RFC
209 RPL_TRACECLASS RFC2812 Class <class> <count> See RFC
210 RPL_TRACERECONNECT RFC2812
210 RPL_STATS aircd Used instead of having multiple stats numerics
211 RPL_STATSLINKINFO RFC1459 <linkname> <sendq> <sent_msgs> <sent_bytes> <recvd_msgs> <rcvd_bytes> <time_open> Reply to STATS (See RFC)
212 RPL_STATSCOMMANDS RFC1459 <command> <count> [<byte_count> <remote_count>] Reply to STATS (See RFC)
213 RPL_STATSCLINE RFC1459 C <host> * <name> <port> <class> Reply to STATS (See RFC)
214 RPL_STATSNLINE RFC1459 N <host> * <name> <port> <class> Reply to STATS (See RFC), Also known as RPL_STATSOLDNLINE (ircu, Unreal)
215 RPL_STATSILINE RFC1459 I <host> * <host> <port> <class> Reply to STATS (See RFC)
216 RPL_STATSKLINE RFC1459 K <host> * <username> <port> <class> Reply to STATS (See RFC)
217 RPL_STATSQLINE RFC1459
217 RPL_STATSPLINE ircu
218 RPL_STATSYLINE RFC1459 Y <class> <ping_freq> <connect_freq> <max_sendq> Reply to STATS (See RFC)
219 RPL_ENDOFSTATS RFC1459 <query> :<info> End of RPL_STATS* list.
220 RPL_STATSPLINE Hybrid
220 RPL_STATSBLINE Bahamut, Unreal
221 RPL_UMODEIS RFC1459 <user_modes> [<user_mode_params>] Information about a user's own modes. Some daemons have extended the mode command and certain modes take parameters (like channel modes).
222 RPL_MODLIST
222 RPL_SQLINE_NICK Unreal
222 RPL_STATSBLINE Bahamut
223 RPL_STATSELINE Bahamut
223 RPL_STATSGLINE Unreal
224 RPL_STATSFLINE Hybrid, Bahamut
224 RPL_STATSTLINE Unreal
225 RPL_STATSDLINE Hybrid
225 RPL_STATSZLINE Bahamut
225 RPL_STATSELINE Unreal
226 RPL_STATSCOUNT Bahamut
226 RPL_STATSNLINE Unreal
227 RPL_STATSGLINE Bahamut
227 RPL_STATSVLINE Unreal
228 RPL_STATSQLINE ircu
231 RPL_SERVICEINFO RFC1459
232 RPL_ENDOFSERVICES RFC1459
232 RPL_RULES Unreal
233 RPL_SERVICE RFC1459
234 RPL_SERVLIST RFC2812 <name> <server> <mask> <type> <hopcount> <info> A service entry in the service list
235 RPL_SERVLISTEND RFC2812 <mask> <type> :<info> Termination of an RPL_SERVLIST list
236 RPL_STATSVERBOSE ircu Verbose server list?
237 RPL_STATSENGINE ircu Engine name?
238 RPL_STATSFLINE ircu Feature lines?
239 RPL_STATSIAUTH IRCnet
240 RPL_STATSVLINE RFC2812
240 RPL_STATSXLINE AustHex
241 RPL_STATSLLINE RFC1459 L <hostmask> * <servername> <maxdepth> Reply to STATS (See RFC)
242 RPL_STATSUPTIME RFC1459 :Server Up <days> days <hours>:<minutes>:<seconds> Reply to STATS (See RFC)
243 RPL_STATSOLINE RFC1459 O <hostmask> * <nick> [:<info>] Reply to STATS (See RFC); The info field is an extension found in some IRC daemons, which returns info such as an e-mail address or the name/job of an operator
244 RPL_STATSHLINE RFC1459 H <hostmask> * <servername> Reply to STATS (See RFC)
245 RPL_STATSSLINE Bahamut, IRCnet, Hybrid
246 RPL_STATSPING RFC2812
246 RPL_STATSTLINE ircu
246 RPL_STATSULINE Hybrid
247 RPL_STATSBLINE RFC2812
247 RPL_STATSXLINE Hybrid, PTlink, Unreal
247 RPL_STATSGLINE ircu
248 RPL_STATSULINE ircu
248 RPL_STATSDEFINE IRCnet
249 RPL_STATSULINE Extension to RFC1459?
249 RPL_STATSDEBUG Hybrid
250 RPL_STATSDLINE RFC2812
250 RPL_STATSCONN ircu, Unreal
251 RPL_LUSERCLIENT RFC1459 :There are <int> users and <int> invisible on <int> servers Reply to LUSERS command, other versions exist (eg. RFC2812); Text may vary.
252 RPL_LUSEROP RFC1459 <int> :<info> Reply to LUSERS command - Number of IRC operators online
253 RPL_LUSERUNKNOWN RFC1459 <int> :<info> Reply to LUSERS command - Number of unknown/unregistered connections
254 RPL_LUSERCHANNELS RFC1459 <int> :<info> Reply to LUSERS command - Number of channels formed
255 RPL_LUSERME RFC1459 :I have <int> clients and <int> servers Reply to LUSERS command - Information about local connections; Text may vary.
256 RPL_ADMINME RFC1459 <server> :<info> Start of an RPL_ADMIN* reply. In practise, the server parameter is often never given, and instead the info field contains the text 'Administrative info about <server>'. Newer daemons seem to follow the RFC and output the server's hostname in the 'server' parameter, but also output the server name in the text as per traditional daemons.
257 RPL_ADMINLOC1 RFC1459 :<admin_location> Reply to ADMIN command (Location, first line)
258 RPL_ADMINLOC2 RFC1459 :<admin_location> Reply to ADMIN command (Location, second line)
259 RPL_ADMINEMAIL RFC1459 :<email_address> Reply to ADMIN command (E-mail address of administrator)
261 RPL_TRACELOG RFC1459 File <logfile> <debug_level> See RFC
262 RPL_TRACEPING Extension to RFC1459?
262 RPL_TRACEEND RFC2812 <server_name> <version>[.<debug_level>] :<info> Used to terminate a list of RPL_TRACE* replies
263 RPL_TRYAGAIN RFC2812 <command> :<info> When a server drops a command without processing it, it MUST use this reply. Also known as RPL_LOAD_THROTTLED and RPL_LOAD2HI, I'm presuming they do the same thing.
265 RPL_LOCALUSERS aircd, Hybrid, Hybrid, Bahamut Also known as RPL_CURRENT_LOCAL
266 RPL_GLOBALUSERS aircd, Hybrid, Hybrid, Bahamut Also known as RPL_CURRENT_GLOBAL
267 RPL_START_NETSTAT aircd
268 RPL_NETSTAT aircd
269 RPL_END_NETSTAT aircd
270 RPL_PRIVS ircu
271 RPL_SILELIST ircu
272 RPL_ENDOFSILELIST ircu
273 RPL_NOTIFY aircd
274 RPL_ENDNOTIFY aircd
274 RPL_STATSDELTA IRCnet
275 RPL_STATSDLINE ircu, Ultimate
276 RPL_VCHANEXIST
277 RPL_VCHANLIST
278 RPL_VCHANHELP
280 RPL_GLIST ircu
281 RPL_ENDOFGLIST ircu
281 RPL_ACCEPTLIST
282 RPL_ENDOFACCEPT
282 RPL_JUPELIST ircu
283 RPL_ALIST
283 RPL_ENDOFJUPELIST ircu
284 RPL_ENDOFALIST
284 RPL_FEATURE ircu
285 RPL_GLIST_HASH
285 RPL_CHANINFO_HANDLE aircd
285 RPL_NEWHOSTIS QuakeNet
286 RPL_CHANINFO_USERS aircd
286 RPL_CHKHEAD QuakeNet
287 RPL_CHANINFO_CHOPS aircd
287 RPL_CHANUSER QuakeNet
288 RPL_CHANINFO_VOICES aircd
288 RPL_PATCHHEAD QuakeNet
289 RPL_CHANINFO_AWAY aircd
289 RPL_PATCHCON QuakeNet
290 RPL_CHANINFO_OPERS aircd
290 RPL_HELPHDR Unreal
290 RPL_DATASTR QuakeNet
291 RPL_CHANINFO_BANNED aircd
291 RPL_HELPOP Unreal
291 RPL_ENDOFCHECK QuakeNet
292 RPL_CHANINFO_BANS aircd
292 RPL_HELPTLR Unreal
293 RPL_CHANINFO_INVITE aircd
293 RPL_HELPHLP Unreal
294 RPL_CHANINFO_INVITES aircd
294 RPL_HELPFWD Unreal
295 RPL_CHANINFO_KICK aircd
295 RPL_HELPIGN Unreal
296 RPL_CHANINFO_KICKS aircd
299 RPL_END_CHANINFO aircd
300 RPL_NONE RFC1459 Dummy reply, supposedly only used for debugging/testing new features, however has appeared in production daemons.
301 RPL_AWAY RFC1459 <nick> :<message> Used in reply to a command directed at a user who is marked as away
301 RPL_AWAY KineIRCd <nick> <seconds away> :<message> Identical to RPL_AWAY, however this includes the number of seconds the user has been away for. This is designed to discourage the need for people to use those horrible scripts which set the AWAY message every 30 seconds in order to include an 'away since' timer.
302 RPL_USERHOST RFC1459 :*1<reply> *( ' ' <reply> ) Reply used by USERHOST (see RFC)
303 RPL_ISON RFC1459 :*1<nick> *( ' ' <nick> ) Reply to the ISON command (see RFC)
304 RPL_TEXT
305 RPL_UNAWAY RFC1459 :<info> Reply from AWAY when no longer marked as away
306 RPL_NOWAWAY RFC1459 :<info> Reply from AWAY when marked away
307 RPL_USERIP
307 RPL_WHOISREGNICK Bahamut, Unreal
307 RPL_SUSERHOST AustHex
308 RPL_NOTIFYACTION aircd
308 RPL_WHOISADMIN Bahamut
308 RPL_RULESSTART Unreal
309 RPL_NICKTRACE aircd
309 RPL_WHOISSADMIN Bahamut
309 RPL_ENDOFRULES Unreal
309 RPL_WHOISHELPER AustHex
310 RPL_WHOISSVCMSG Bahamut
310 RPL_WHOISHELPOP Unreal
310 RPL_WHOISSERVICE AustHex
311 RPL_WHOISUSER RFC1459 <nick> <user> <host> * :<real_name> Reply to WHOIS - Information about the user
312 RPL_WHOISSERVER RFC1459 <nick> <server> :<server_info> Reply to WHOIS - What server they're on
313 RPL_WHOISOPERATOR RFC1459 <nick> :<privileges> Reply to WHOIS - User has IRC Operator privileges
314 RPL_WHOWASUSER RFC1459 <nick> <user> <host> * :<real_name> Reply to WHOWAS - Information about the user
315 RPL_ENDOFWHO RFC1459 <name> :<info> Used to terminate a list of RPL_WHOREPLY replies
316 RPL_WHOISCHANOP RFC1459
317 RPL_WHOISIDLE RFC1459 <nick> <seconds> :seconds idle Reply to WHOIS - Idle information
318 RPL_ENDOFWHOIS RFC1459 <nick> :<info> Reply to WHOIS - End of list
319 RPL_WHOISCHANNELS RFC1459 <nick> :*( ( '@' / '+' ) <channel> ' ' ) Reply to WHOIS - Channel list for user (See RFC)
320 RPL_WHOISVIRT AustHex
320 RPL_WHOIS_HIDDEN Anothernet
320 RPL_WHOISSPECIAL Unreal
321 RPL_LISTSTART RFC1459 Channels :Users Name Channel list - Header
322 RPL_LIST RFC1459 <channel> <#_visible> :<topic> Channel list - A channel
323 RPL_LISTEND RFC1459 :<info> Channel list - End of list
324 RPL_CHANNELMODEIS RFC1459 <channel> <mode> <mode_params>
325 RPL_UNIQOPIS RFC2812 <channel> <nickname>
325 RPL_CHANNELPASSIS
326 RPL_NOCHANPASS
327 RPL_CHPASSUNKNOWN
328 RPL_CHANNEL_URL Bahamut, AustHex
329 RPL_CREATIONTIME Bahamut
330 RPL_WHOWAS_TIME
330 RPL_WHOISACCOUNT ircu <nick> <authname> :<info>
331 RPL_NOTOPIC RFC1459 <channel> :<info> Response to TOPIC when no topic is set
332 RPL_TOPIC RFC1459 <channel> :<topic> Response to TOPIC with the set topic
333 RPL_TOPICWHOTIME ircu
334 RPL_LISTUSAGE ircu
334 RPL_COMMANDSYNTAX Bahamut
334 RPL_LISTSYNTAX Unreal
335 RPL_WHOISBOT Unreal
338 RPL_CHANPASSOK
338 RPL_WHOISACTUALLY ircu, Bahamut
339 RPL_BADCHANPASS
340 RPL_USERIP ircu
341 RPL_INVITING RFC1459 <nick> <channel> Returned by the server to indicate that the attempted INVITE message was successful and is being passed onto the end client. Note that RFC1459 documents the parameters in the reverse order. The format given here is the format used on production servers, and should be considered the standard reply above that given by RFC1459.
342 RPL_SUMMONING RFC1459 <user> :<info> Returned by a server answering a SUMMON message to indicate that it is summoning that user
345 RPL_INVITED GameSurge <channel> <user being invited> <user issuing invite> :<user being invited> has been invited by <user issuing invite> Sent to users on a channel when an INVITE command has been issued
346 RPL_INVITELIST RFC2812 <channel> <invitemask> An invite mask for the invite mask list
347 RPL_ENDOFINVITELIST RFC2812 <channel> :<info> Termination of an RPL_INVITELIST list
348 RPL_EXCEPTLIST RFC2812 <channel> <exceptionmask> An exception mask for the exception mask list. Also known as RPL_EXLIST (Unreal, Ultimate)
349 RPL_ENDOFEXCEPTLIST RFC2812 <channel> :<info> Termination of an RPL_EXCEPTLIST list. Also known as RPL_ENDOFEXLIST (Unreal, Ultimate)
351 RPL_VERSION RFC1459 <version>[.<debuglevel>] <server> :<comments> Reply by the server showing its version details, however this format is not often adhered to
352 RPL_WHOREPLY RFC1459 <channel> <user> <host> <server> <nick> <H|G>[*][@|+] :<hopcount> <real_name> Reply to vanilla WHO (See RFC). This format can be very different if the 'WHOX' version of the command is used (see ircu).
353 RPL_NAMREPLY RFC1459 ( '=' / '*' / '@' ) <channel> ' ' : [ '@' / '+' ] <nick> *( ' ' [ '@' / '+' ] <nick> ) Reply to NAMES (See RFC)
354 RPL_WHOSPCRPL ircu Reply to WHO, however it is a 'special' reply because it is returned using a non-standard (non-RFC1459) format. The format is dictated by the command given by the user, and can vary widely. When this is used, the WHO command was invoked in its 'extended' form, as announced by the 'WHOX' ISUPPORT tag.
355 RPL_NAMREPLY_ QuakeNet ( '=' / '*' / '@' ) <channel> ' ' : [ '@' / '+' ] <nick> *( ' ' [ '@' / '+' ] <nick> ) Reply to the "NAMES -d" command - used to show invisible users (when the channel is set +D, QuakeNet relative). The proper define name for this numeric is unknown at this time Also see #353.
357 RPL_MAP AustHex
358 RPL_MAPMORE AustHex
359 RPL_MAPEND AustHex
361 RPL_KILLDONE RFC1459
362 RPL_CLOSING RFC1459
363 RPL_CLOSEEND RFC1459
364 RPL_LINKS RFC1459 <mask> <server> :<hopcount> <server_info> Reply to the LINKS command
365 RPL_ENDOFLINKS RFC1459 <mask> :<info> Termination of an RPL_LINKS list
366 RPL_ENDOFNAMES RFC1459 <channel> :<info> Termination of an RPL_NAMREPLY list
367 RPL_BANLIST RFC1459 <channel> <banid> [<time_left> :<reason>] A ban-list item (See RFC); <time left> and <reason> are additions used by KineIRCd
368 RPL_ENDOFBANLIST RFC1459 <channel> :<info> Termination of an RPL_BANLIST list
369 RPL_ENDOFWHOWAS RFC1459 <nick> :<info> Reply to WHOWAS - End of list
371 RPL_INFO RFC1459 :<string> Reply to INFO
372 RPL_MOTD RFC1459 :- <string> Reply to MOTD
373 RPL_INFOSTART RFC1459
374 RPL_ENDOFINFO RFC1459 :<info> Termination of an RPL_INFO list
375 RPL_MOTDSTART RFC1459 :- <server> Message of the day - Start of an RPL_MOTD list
376 RPL_ENDOFMOTD RFC1459 :<info> Termination of an RPL_MOTD list
377 RPL_KICKEXPIRED aircd
377 RPL_SPAM AustHex :<text> Used during the connection (after MOTD) to announce the network policy on spam and privacy. Supposedly now obsoleted in favour of using NOTICE.
378 RPL_BANEXPIRED aircd
378 RPL_WHOISHOST Unreal
378 RPL_MOTD AustHex Used by AustHex to 'force' the display of the MOTD, however is considered obsolete due to client/script awareness & ability to Also see #372.
379 RPL_KICKLINKED aircd
379 RPL_WHOISMODES Unreal
380 RPL_BANLINKED aircd
380 RPL_YOURHELPER AustHex
381 RPL_YOUREOPER RFC1459 :<info> Successful reply from OPER
382 RPL_REHASHING RFC1459 <config_file> :<info> Successful reply from REHASH
383 RPL_YOURESERVICE RFC2812 :You are service <service_name> Sent upon successful registration of a service
384 RPL_MYPORTIS RFC1459
385 RPL_NOTOPERANYMORE AustHex, Hybrid, Unreal
386 RPL_QLIST Unreal
386 RPL_IRCOPS Ultimate
387 RPL_ENDOFQLIST Unreal
387 RPL_ENDOFIRCOPS Ultimate
388 RPL_ALIST Unreal
389 RPL_ENDOFALIST Unreal
391 RPL_TIME RFC1459 <server> :<time string> Response to the TIME command. The string format may vary greatly. Also see #679.
391 RPL_TIME ircu <server> <timestamp> <offset> :<time string> This extention adds the timestamp and timestamp-offet information for clients.
391 RPL_TIME bdq-ircd <server> <timezone name> <microseconds> :<time string> Timezone name is acronym style (eg. 'EST', 'PST' etc). The microseconds field is the number of microseconds since the UNIX epoch, however it is relative to the local timezone of the server. The timezone field is ambiguous, since it only appears to include American zones.
391 RPL_TIME <server> <year> <month> <day> <hour> <minute> <second> Yet another variation, including the time broken down into its components. Time is supposedly relative to UTC.
392 RPL_USERSSTART RFC1459 :UserID Terminal Host Start of an RPL_USERS list
393 RPL_USERS RFC1459 :<username> <ttyline> <hostname> Response to the USERS command (See RFC)
394 RPL_ENDOFUSERS RFC1459 :<info> Termination of an RPL_USERS list
395 RPL_NOUSERS RFC1459 :<info> Reply to USERS when nobody is logged in
396 RPL_HOSTHIDDEN Undernet Reply to a user when user mode +x (host masking) was set successfully
400 ERR_UNKNOWNERROR <command> [<?>] :<info> Sent when an error occured executing a command, but it is not specifically known why the command could not be executed.
401 ERR_NOSUCHNICK RFC1459 <nick> :<reason> Used to indicate the nickname parameter supplied to a command is currently unused
402 ERR_NOSUCHSERVER RFC1459 <server> :<reason> Used to indicate the server name given currently doesn't exist
403 ERR_NOSUCHCHANNEL RFC1459 <channel> :<reason> Used to indicate the given channel name is invalid, or does not exist
404 ERR_CANNOTSENDTOCHAN RFC1459 <channel> :<reason> Sent to a user who does not have the rights to send a message to a channel
405 ERR_TOOMANYCHANNELS RFC1459 <channel> :<reason> Sent to a user when they have joined the maximum number of allowed channels and they tried to join another channel
406 ERR_WASNOSUCHNICK RFC1459 <nick> :<reason> Returned by WHOWAS to indicate there was no history information for a given nickname
407 ERR_TOOMANYTARGETS RFC1459 <target> :<reason> The given target(s) for a command are ambiguous in that they relate to too many targets
408 ERR_NOSUCHSERVICE RFC2812 <service_name> :<reason> Returned to a client which is attempting to send an SQUERY (or other message) to a service which does not exist
408 ERR_NOCOLORSONCHAN Bahamut
409 ERR_NOORIGIN RFC1459 :<reason> PING or PONG message missing the originator parameter which is required since these commands must work without valid prefixes
411 ERR_NORECIPIENT RFC1459 :<reason> Returned when no recipient is given with a command
412 ERR_NOTEXTTOSEND RFC1459 :<reason> Returned when NOTICE/PRIVMSG is used with no message given
413 ERR_NOTOPLEVEL RFC1459 <mask> :<reason> Used when a message is being sent to a mask without being limited to a top-level domain (i.e. * instead of *.au)
414 ERR_WILDTOPLEVEL RFC1459 <mask> :<reason> Used when a message is being sent to a mask with a wild-card for a top level domain (i.e. *.*)
415 ERR_BADMASK RFC2812 <mask> :<reason> Used when a message is being sent to a mask with an invalid syntax
416 ERR_TOOMANYMATCHES IRCnet <command> [<mask>] :<info> Returned when too many matches have been found for a command and the output has been truncated. An example would be the WHO command, where by the mask '*' would match everyone on the network! Ouch!
416 ERR_QUERYTOOLONG ircu Same as ERR_TOOMANYMATCHES
419 ERR_LENGTHTRUNCATED aircd
421 ERR_UNKNOWNCOMMAND RFC1459 <command> :<reason> Returned when the given command is unknown to the server (or hidden because of lack of access rights)
422 ERR_NOMOTD RFC1459 :<reason> Sent when there is no MOTD to send the client
423 ERR_NOADMININFO RFC1459 <server> :<reason> Returned by a server in response to an ADMIN request when no information is available. RFC1459 mentions this in the list of numerics. While it's not listed as a valid reply in section 4.3.7 ('Admin command'), it's confirmed to exist in the real world.
424 ERR_FILEERROR RFC1459 :<reason> Generic error message used to report a failed file operation during the processing of a command
425 ERR_NOOPERMOTD Unreal
429 ERR_TOOMANYAWAY Bahamut
430 ERR_EVENTNICKCHANGE AustHex Returned by NICK when the user is not allowed to change their nickname due to a channel event (channel mode +E)
431 ERR_NONICKNAMEGIVEN RFC1459 :<reason> Returned when a nickname parameter expected for a command isn't found
432 ERR_ERRONEUSNICKNAME RFC1459 <nick> :<reason> Returned after receiving a NICK message which contains a nickname which is considered invalid, such as it's reserved ('anonymous') or contains characters considered invalid for nicknames. This numeric is misspelt, but remains with this name for historical reasons :)
433 ERR_NICKNAMEINUSE RFC1459 <nick> :<reason> Returned by the NICK command when the given nickname is already in use
434 ERR_SERVICENAMEINUSE AustHex?
434 ERR_NORULES Unreal, Ultimate
435 ERR_SERVICECONFUSED Unreal
435 ERR_BANONCHAN Bahamut
436 ERR_NICKCOLLISION RFC1459 <nick> :<reason> Returned by a server to a client when it detects a nickname collision
437 ERR_UNAVAILRESOURCE RFC2812 <nick/channel/service> :<reason> Return when the target is unable to be reached temporarily, eg. a delay mechanism in play, or a service being offline
437 ERR_BANNICKCHANGE ircu
438 ERR_NICKTOOFAST ircu Also known as ERR_NCHANGETOOFAST (Unreal, Ultimate)
438 ERR_DEAD IRCnet
439 ERR_TARGETTOOFAST ircu Also known as many other things, RPL_INVTOOFAST, RPL_MSGTOOFAST etc
440 ERR_SERVICESDOWN Bahamut, Unreal
441 ERR_USERNOTINCHANNEL RFC1459 <nick> <channel> :<reason> Returned by the server to indicate that the target user of the command is not on the given channel
442 ERR_NOTONCHANNEL RFC1459 <channel> :<reason> Returned by the server whenever a client tries to perform a channel effecting command for which the client is not a member
443 ERR_USERONCHANNEL RFC1459 <nick> <channel> [:<reason>] Returned when a client tries to invite a user to a channel they're already on
444 ERR_NOLOGIN RFC1459 <user> :<reason> Returned by the SUMMON command if a given user was not logged in and could not be summoned
445 ERR_SUMMONDISABLED RFC1459 :<reason> Returned by SUMMON when it has been disabled or not implemented
446 ERR_USERSDISABLED RFC1459 :<reason> Returned by USERS when it has been disabled or not implemented
447 ERR_NONICKCHANGE Unreal
449 ERR_NOTIMPLEMENTED Undernet Unspecified Returned when a requested feature is not implemented (and cannot be completed)
451 ERR_NOTREGISTERED RFC1459 :<reason> Returned by the server to indicate that the client must be registered before the server will allow it to be parsed in detail
452 ERR_IDCOLLISION
453 ERR_NICKLOST
455 ERR_HOSTILENAME Unreal
456 ERR_ACCEPTFULL
457 ERR_ACCEPTEXIST
458 ERR_ACCEPTNOT
459 ERR_NOHIDING Unreal Not allowed to become an invisible operator?
460 ERR_NOTFORHALFOPS Unreal
461 ERR_NEEDMOREPARAMS RFC1459 <command> :<reason> Returned by the server by any command which requires more parameters than the number of parameters given
462 ERR_ALREADYREGISTERED RFC1459 :<reason> Returned by the server to any link which attempts to register again
463 ERR_NOPERMFORHOST RFC1459 :<reason> Returned to a client which attempts to register with a server which has been configured to refuse connections from the client's host
464 ERR_PASSWDMISMATCH RFC1459 :<reason> Returned by the PASS command to indicate the given password was required and was either not given or was incorrect
465 ERR_YOUREBANNEDCREEP RFC1459 :<reason> Returned to a client after an attempt to register on a server configured to ban connections from that client
466 ERR_YOUWILLBEBANNED RFC1459 Sent by a server to a user to inform that access to the server will soon be denied
467 ERR_KEYSET RFC1459 <channel> :<reason> Returned when the channel key for a channel has already been set
468 ERR_INVALIDUSERNAME ircu
468 ERR_ONLYSERVERSCANCHANGE Bahamut, Unreal
469 ERR_LINKSET Unreal
470 ERR_LINKCHANNEL Unreal
470 ERR_KICKEDFROMCHAN aircd
471 ERR_CHANNELISFULL RFC1459 <channel> :<reason> Returned when attempting to join a channel which is set +l and is already full
472 ERR_UNKNOWNMODE RFC1459 <char> :<reason> Returned when a given mode is unknown
473 ERR_INVITEONLYCHAN RFC1459 <channel> :<reason> Returned when attempting to join a channel which is invite only without an invitation
474 ERR_BANNEDFROMCHAN RFC1459 <channel> :<reason> Returned when attempting to join a channel a user is banned from
475 ERR_BADCHANNELKEY RFC1459 <channel> :<reason> Returned when attempting to join a key-locked channel either without a key or with the wrong key
476 ERR_BADCHANMASK RFC2812 <channel> :<reason> The given channel mask was invalid
477 ERR_NOCHANMODES RFC2812 <channel> :<reason> Returned when attempting to set a mode on a channel which does not support channel modes, or channel mode changes. Also known as ERR_MODELESS
477 ERR_NEEDREGGEDNICK Bahamut, ircu, Unreal
478 ERR_BANLISTFULL RFC2812 <channel> <char> :<reason> Returned when a channel access list (i.e. ban list etc) is full and cannot be added to
479 ERR_BADCHANNAME Hybrid
479 ERR_LINKFAIL Unreal
480 ERR_NOULINE AustHex
480 ERR_CANNOTKNOCK Unreal
481 ERR_NOPRIVILEGES RFC1459 :<reason> Returned by any command requiring special privileges (eg. IRC operator) to indicate the operation was unsuccessful
482 ERR_CHANOPRIVSNEEDED RFC1459 <channel> :<reason> Returned by any command requiring special channel privileges (eg. channel operator) to indicate the operation was unsuccessful
483 ERR_CANTKILLSERVER RFC1459 :<reason> Returned by KILL to anyone who tries to kill a server
484 ERR_RESTRICTED RFC2812 :<reason> Sent by the server to a user upon connection to indicate the restricted nature of the connection (i.e. usermode +r)
484 ERR_ISCHANSERVICE Undernet
484 ERR_DESYNC Bahamut, Hybrid, PTlink
484 ERR_ATTACKDENY Unreal
485 ERR_UNIQOPRIVSNEEDED RFC2812 :<reason> Any mode requiring 'channel creator' privileges returns this error if the client is attempting to use it while not a channel creator on the given channel
485 ERR_KILLDENY Unreal
485 ERR_CANTKICKADMIN PTlink
485 ERR_ISREALSERVICE QuakeNet
486 ERR_NONONREG
486 ERR_HTMDISABLED Unreal
486 ERR_ACCOUNTONLY QuakeNet
487 ERR_CHANTOORECENT IRCnet
487 ERR_MSGSERVICES Bahamut
488 ERR_TSLESSCHAN IRCnet
489 ERR_VOICENEEDED Undernet
489 ERR_SECUREONLYCHAN Unreal
491 ERR_NOOPERHOST RFC1459 :<reason> Returned by OPER to a client who cannot become an IRC operator because the server has been configured to disallow the client's host
492 ERR_NOSERVICEHOST RFC1459
493 ERR_NOFEATURE ircu
494 ERR_BADFEATURE ircu
495 ERR_BADLOGTYPE ircu
496 ERR_BADLOGSYS ircu
497 ERR_BADLOGVALUE ircu
498 ERR_ISOPERLCHAN ircu
499 ERR_CHANOWNPRIVNEEDED Unreal Works just like ERR_CHANOPRIVSNEEDED except it indicates that owner status (+q) is needed. Also see #482.
501 ERR_UMODEUNKNOWNFLAG RFC1459 :<reason> Returned by the server to indicate that a MODE message was sent with a nickname parameter and that the mode flag sent was not recognised
502 ERR_USERSDONTMATCH RFC1459 :<reason> Error sent to any user trying to view or change the user mode for a user other than themselves
503 ERR_GHOSTEDCLIENT Hybrid
503 ERR_VWORLDWARN AustHex :<warning_text> Warning about Virtual-World being turned off. Obsoleted in favour for RPL_MODECHANGEWARN Also see #662.
504 ERR_USERNOTONSERV
511 ERR_SILELISTFULL ircu
512 ERR_TOOMANYWATCH Bahamut Also known as ERR_NOTIFYFULL (aircd), I presume they are the same
513 ERR_BADPING ircu Also known as ERR_NEEDPONG (Unreal/Ultimate) for use during registration, however it's not used in Unreal (and might not be used in Ultimate either).
514 ERR_INVALID_ERROR ircu
514 ERR_TOOMANYDCC Bahamut
515 ERR_BADEXPIRE ircu
516 ERR_DONTCHEAT ircu
517 ERR_DISABLED ircu <command> :<info/reason>
518 ERR_NOINVITE Unreal
518 ERR_LONGMASK ircu
519 ERR_ADMONLY Unreal
519 ERR_TOOMANYUSERS ircu
520 ERR_OPERONLY Unreal
520 ERR_MASKTOOWIDE ircu
520 ERR_WHOTRUNC AustHex This is considered obsolete in favour of ERR_TOOMANYMATCHES, and should no longer be used. Also see #416.
521 ERR_LISTSYNTAX Bahamut
522 ERR_WHOSYNTAX Bahamut
523 ERR_WHOLIMEXCEED Bahamut
524 ERR_QUARANTINED ircu
524 ERR_OPERSPVERIFY Unreal
525 ERR_REMOTEPFX CAPAB USERCMDPFX <nickname> :<reason> Proposed.
526 ERR_PFXUNROUTABLE CAPAB USERCMDPFX <nickname> :<reason> Proposed.
550 ERR_BADHOSTMASK QuakeNet
551 ERR_HOSTUNAVAIL QuakeNet
552 ERR_USINGSLINE QuakeNet
553 ERR_STATSSLINE QuakeNet
600 RPL_LOGON Bahamut, Unreal
601 RPL_LOGOFF Bahamut, Unreal
602 RPL_WATCHOFF Bahamut, Unreal
603 RPL_WATCHSTAT Bahamut, Unreal
604 RPL_NOWON Bahamut, Unreal
605 RPL_NOWOFF Bahamut, Unreal
606 RPL_WATCHLIST Bahamut, Unreal
607 RPL_ENDOFWATCHLIST Bahamut, Unreal
608 RPL_WATCHCLEAR Ultimate
610 RPL_MAPMORE Unreal
610 RPL_ISOPER Ultimate
611 RPL_ISLOCOP Ultimate
612 RPL_ISNOTOPER Ultimate
613 RPL_ENDOFISOPER Ultimate
615 RPL_MAPMORE PTlink
615 RPL_WHOISMODES Ultimate
616 RPL_WHOISHOST Ultimate
617 RPL_DCCSTATUS Bahamut
617 RPL_WHOISBOT Ultimate
618 RPL_DCCLIST Bahamut
619 RPL_ENDOFDCCLIST Bahamut
619 RPL_WHOWASHOST Ultimate
620 RPL_DCCINFO Bahamut
620 RPL_RULESSTART Ultimate
621 RPL_RULES Ultimate
622 RPL_ENDOFRULES Ultimate
623 RPL_MAPMORE Ultimate
624 RPL_OMOTDSTART Ultimate
625 RPL_OMOTD Ultimate
626 RPL_ENDOFOUltimate
630 RPL_SETTINGS Ultimate
631 RPL_ENDOFSETTINGS Ultimate
640 RPL_DUMPING Unreal Never actually used by Unreal - was defined however the feature that would have used this numeric was never created.
641 RPL_DUMPRPL Unreal Never actually used by Unreal - was defined however the feature that would have used this numeric was never created.
642 RPL_EODUMP Unreal Never actually used by Unreal - was defined however the feature that would have used this numeric was never created.
660 RPL_TRACEROUTE_HOP KineIRCd <target> <hop#> [<address> [<hostname> | '*'] <usec_ping>] Returned from the TRACEROUTE IRC-Op command when tracerouting a host
661 RPL_TRACEROUTE_START KineIRCd <target> <target_FQDN> <target_address> <max_hops> Start of an RPL_TRACEROUTE_HOP list
662 RPL_MODECHANGEWARN KineIRCd ['+' | '-']<mode_char> :<warning> Plain text warning to the user about turning on or off a user mode. If no '+' or '-' prefix is used for the mode char, '+' is presumed.
663 RPL_CHANREDIR KineIRCd <old_chan> <new_chan> :<info> Used to notify the client upon JOIN that they are joining a different channel than expected because the IRC Daemon has been set up to map the channel they attempted to join to the channel they eventually will join.
664 RPL_SERVMODEIS KineIRCd <server> <modes> <parameters>.. Reply to MODE <servername>. KineIRCd supports server modes to simplify configuration of servers; Similar to RPL_CHANNELMODEIS
665 RPL_OTHERUMODEIS KineIRCd <nickname> <modes> Reply to MODE <nickname> to return the user-modes of another user to help troubleshoot connections, etc. Similar to RPL_UMODEIS, however including the target
666 RPL_ENDOF_GENERIC KineIRCd <command> [<parameter> ...] :<info> Generic response for new lists to save numerics.
670 RPL_WHOWASDETAILS KineIRCd <nick> <type> :<information> Returned by WHOWAS to return extended information (if available). The type field is a number indication what kind of information.
671 RPL_WHOISSECURE KineIRCd <nick> <type> [:<info>] Reply to WHOIS command - Returned if the target is connected securely, eg. type may be TLSv1, or SSLv2 etc. If the type is unknown, a '*' may be used.
672 RPL_UNKNOWNMODES Ithildin <modes> :<info> Returns a full list of modes that are unknown when a client issues a MODE command (rather than one numeric per mode)
673 RPL_CANNOTSETMODES Ithildin <modes> :<info> Returns a full list of modes that cannot be set when a client issues a MODE command
678 RPL_LUSERSTAFF KineIRCd <staff_online_count> :<info> Reply to LUSERS command - Number of network staff (or 'helpers') online (differs from Local/Global operators). Similar format to RPL_LUSEROP
679 RPL_TIMEONSERVERIS KineIRCd <seconds> [<nanoseconds> | '0'] <timezone> <flags> :<info> Optionally sent upon connection, and/or sent as a reply to the TIME command. This returns the time on the server in a uniform manner. The seconds (and optionally nanoseconds) is the time since the UNIX Epoch, and is used since many existing timestamps in the IRC-2 protocol are done this way (i.e. ban lists). The timezone is hours and minutes each of Greenwich ('[+/-]HHMM'). Since all timestamps sent from the server are in a similar format, this numeric is designed to give clients the ability to provide accurate timestamps to their users.
682 RPL_NETWORKS KineIRCd <name> <through_name> <hops> :<info> A reply to the NETWORKS command when requesting a list of known networks (within the IIRC domain).
687 RPL_YOURLANGUAGEIS KineIRCd <code(s)> :<info> Reply to the LANGUAGE command, informing the client of the language(s) it has set
688 RPL_LANGUAGE KineIRCd <code> <revision> <maintainer> <flags> * :<info> A language reply to LANGUAGE when requesting a list of known languages
689 RPL_WHOISSTAFF KineIRCd :<info> The user is a staff member. The information may explain the user's job role, or simply state that they are a part of the network staff. Staff members are not IRC operators, but rather people who have special access in association with network services. KineIRCd uses this numeric instead of the existing numerics due to the overwhelming number of conflicts.
690 RPL_WHOISLANGUAGE KineIRCd <nick> <language codes> Reply to WHOIS command - A list of languages someone can speak. The language codes are comma delimitered.
702 RPL_MODLIST RatBox <?> 0x<?> <?> <?> Output from the MODLIST command
703 RPL_ENDOFMODLIST RatBox :<text> Terminates MODLIST output
704 RPL_HELPSTART RatBox <command> :<text> Start of HELP command output
705 RPL_HELPTXT RatBox <command> :<text> Output from HELP command
706 RPL_ENDOFHELP RatBox <command> :<text> End of HELP command output
708 RPL_ETRACEFULL RatBox <?> <?> <?> <?> <?> <?> <?> :<?> Output from 'extended' trace
709 RPL_ETRACE RatBox <?> <?> <?> <?> <?> <?> :<?> Output from 'extended' trace
710 RPL_KNOCK RatBox <channel> <nick>!<user>@<host> :<text> Message delivered using KNOCK command
711 RPL_KNOCKDLVR RatBox <channel> :<text> Message returned from using KNOCK command
712 ERR_TOOMANYKNOCK RatBox <channel> :<text> Message returned when too many KNOCKs for a channel have been sent by a user
713 ERR_CHANOPEN RatBox <channel> :<text> Message returned from KNOCK when the channel can be freely joined by the user
714 ERR_KNOCKONCHAN RatBox <channel> :<text> Message returned from KNOCK when the user has used KNOCK on a channel they have already joined
715 ERR_KNOCKDISABLED RatBox :<text> Returned from KNOCK when the command has been disabled
716 RPL_TARGUMODEG RatBox <nick> :<info> Sent to indicate the given target is set +g (server-side ignore)
717 RPL_TARGNOTIFY RatBox <nick> :<info> Sent following a PRIVMSG/NOTICE to indicate the target has been notified of an attempt to talk to them while they are set +g
718 RPL_UMODEGMSG RatBox <nick> <user>@<host> :<info> Sent to a user who is +g to inform them that someone has attempted to talk to them (via PRIVMSG/NOTICE), and that they will need to be accepted (via the ACCEPT command) before being able to talk to them
720 RPL_OMOTDSTART RatBox :<text> IRC Operator MOTD header, sent upon OPER command
721 RPL_OMOTD RatBox :<text> IRC Operator MOTD text (repeated, usually)
722 RPL_ENDOFOMOTD RatBox :<text> IRC operator MOTD footer
723 ERR_NOPRIVS RatBox <command> :<text> Returned from an oper command when the IRC operator does not have the relevant operator privileges.
724 RPL_TESTMARK RatBox <nick>!<user>@<host> <?> <?> :<text> Reply from an oper command reporting how many users match a given user@host mask
725 RPL_TESTLINE RatBox <?> <?> <?> :<?> Reply from an oper command reporting relevant I/K lines that will match a given user@host
726 RPL_NOTESTLINE RatBox <?> :<text> Reply from oper command reporting no I/K lines match the given user@host
771 RPL_XINFO Ithildin Used to send 'eXtended info' to the client, a replacement for the STATS command to send a large variety of data and minimise numeric pollution.
773 RPL_XINFOSTART Ithildin Start of an RPL_XINFO list
774 RPL_XINFOEND Ithildin Termination of an RPL_XINFO list
972 ERR_CANNOTDOCOMMAND Unreal Works similarly to all of KineIRCd's CANNOT* numerics. This one indicates that a command could not be performed for an arbitrary reason. For example, a halfop trying to kick an op.
973 ERR_CANNOTCHANGEUMODE KineIRCd <mode_char> :<reason> Reply to MODE when a user cannot change a user mode
974 ERR_CANNOTCHANGECHANMODE KineIRCd <mode_char> :<reason> Reply to MODE when a user cannot change a channel mode
975 ERR_CANNOTCHANGESERVERMODE KineIRCd <mode_char> :<reason> Reply to MODE when a user cannot change a server mode
976 ERR_CANNOTSENDTONICK KineIRCd <nick> :<reason> Returned from NOTICE, PRIVMSG or other commands to notify the user that they cannot send a message to a particular client. Similar to ERR_CANNOTSENDTOCHAN. KineIRCd uses this in conjunction with user-mode +R to allow users to block people who are not identified to services (spam avoidance)
977 ERR_UNKNOWNSERVERMODE KineIRCd <modechar> :<info> Returned by MODE to inform the client they used an unknown server mode character.
979 ERR_SERVERMODELOCK KineIRCd <target> :<info> Returned by MODE to inform the client the server has been set mode +L by an administrator to stop server modes being changed
980 ERR_BADCHARENCODING KineIRCd <command> <charset> :<info> Returned by any command which may have had the given data modified because one or more glyphs were incorrectly encoded in the current charset (given). Such a use would be where an invalid UTF-8 sequence was given which may be considered insecure, or defines a character which is invalid within that context. For safety reasons, the invalid character is not returned to the client.
981 ERR_TOOMANYLANGUAGES KineIRCd <max_langs> :<info> Returned by the LANGUAGE command to tell the client they cannot set as many languages as they have requested. To assist the client, the maximum languages which can be set at one time is given, and the language settings are not changed.
982 ERR_NOLANGUAGE KineIRCd <language_code> :<info> Returned by the LANGUAGE command to tell the client it has specified an unknown language code.
983 ERR_TEXTTOOSHORT KineIRCd <command> :<info> Returned by any command requiring text (such as a message or a reason), which was not long enough to be considered valid. This was created initially to combat '/wallops foo' abuse, but is also used by DIE and RESTART commands to attempt to encourage meaningful reasons.
999 ERR_NUMERIC_ERR Bahamut Also known as ERR_NUMERICERR (Unreal)

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