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+001 RPL_WELCOME
+ "Welcome to the Internet Relay Network
+ <nick>!<user>@<host>"
+002 RPL_YOURHOST
+ "Your host is <servername>, running version <ver>"
+003 RPL_CREATED
+ "This server was created <date>"
+004 RPL_MYINFO
+ "<servername> <version> <available user modes>
+ <available channel modes>"
+
+ - The server sends Replies 001 to 004 to a user upon
+ successful registration.
+
+005 RPL_BOUNCE
+ "Try server <server name>, port <port number>"
+
+ - Sent by the server to a user to suggest an alternative
+ server. This is often used when the connection is
+ refused because the server is already full.
+
+302 RPL_USERHOST
+ ":*1<reply> *( " " <reply> )"
+
+ - Reply format used by USERHOST to list replies to
+ the query list. The reply string is composed as
+ follows:
+
+ reply = nickname [ "*" ] "=" ( "+" / "-" ) hostname
+
+ The '*' indicates whether the client has registered
+ as an Operator. The '-' or '+' characters represent
+ whether the client has set an AWAY message or not
+ respectively.
+
+303 RPL_ISON
+ ":*1<nick> *( " " <nick> )"
+
+ - Reply format used by ISON to list replies to the
+ query list.
+
+301 RPL_AWAY
+ "<nick> :<away message>"
+305 RPL_UNAWAY
+ ":You are no longer marked as being away"
+306 RPL_NOWAWAY
+ ":You have been marked as being away"
+
+ - These replies are used with the AWAY command (if
+ allowed). RPL_AWAY is sent to any client sending a
+ PRIVMSG to a client which is away. RPL_AWAY is only
+ sent by the server to which the client is connected.
+ Replies RPL_UNAWAY and RPL_NOWAWAY are sent when the
+ client removes and sets an AWAY message.
+
+311 RPL_WHOISUSER
+ "<nick> <user> <host> * :<real name>"
+312 RPL_WHOISSERVER
+ "<nick> <server> :<server info>"
+313 RPL_WHOISOPERATOR
+ "<nick> :is an IRC operator"
+317 RPL_WHOISIDLE
+ "<nick> <integer> :seconds idle"
+318 RPL_ENDOFWHOIS
+ "<nick> :End of WHOIS list"
+319 RPL_WHOISCHANNELS
+ "<nick> :*( ( "@" / "+" ) <channel> " " )"
+
+ - Replies 311 - 313, 317 - 319 are all replies
+ generated in response to a WHOIS message. Given that
+ there are enough parameters present, the answering
+ server MUST either formulate a reply out of the above
+ numerics (if the query nick is found) or return an
+ error reply. The '*' in RPL_WHOISUSER is there as
+ the literal character and not as a wild card. For
+ each reply set, only RPL_WHOISCHANNELS may appear
+ more than once (for long lists of channel names).
+ The '@' and '+' characters next to the channel name
+ indicate whether a client is a channel operator or
+ has been granted permission to speak on a moderated
+ channel. The RPL_ENDOFWHOIS reply is used to mark
+ the end of processing a WHOIS message.
+
+314 RPL_WHOWASUSER
+ "<nick> <user> <host> * :<real name>"
+369 RPL_ENDOFWHOWAS
+ "<nick> :End of WHOWAS"
+
+ - When replying to a WHOWAS message, a server MUST use
+ the replies RPL_WHOWASUSER, RPL_WHOISSERVER or
+ ERR_WASNOSUCHNICK for each nickname in the presented
+ list. At the end of all reply batches, there MUST
+ be RPL_ENDOFWHOWAS (even if there was only one reply
+ and it was an error).
+
+321 RPL_LISTSTART
+ Obsolete. Not used.
+
+322 RPL_LIST
+ "<channel> <# visible> :<topic>"
+323 RPL_LISTEND
+ ":End of LIST"
+
+ - Replies RPL_LIST, RPL_LISTEND mark the actual replies
+ with data and end of the server's response to a LIST
+ command. If there are no channels available to return,
+ only the end reply MUST be sent.
+
+325 RPL_UNIQOPIS
+ "<channel> <nickname>"
+
+324 RPL_CHANNELMODEIS
+ "<channel> <mode> <mode params>"
+
+331 RPL_NOTOPIC
+ "<channel> :No topic is set"
+332 RPL_TOPIC
+ "<channel> :<topic>"
+
+ - When sending a TOPIC message to determine the
+ channel topic, one of two replies is sent. If
+ the topic is set, RPL_TOPIC is sent back else
+ RPL_NOTOPIC.
+
+341 RPL_INVITING
+ "<channel> <nick>"
+
+ - Returned by the server to indicate that the
+ attempted INVITE message was successful and is
+ being passed onto the end client.
+
+342 RPL_SUMMONING
+ "<user> :Summoning user to IRC"
+
+ - Returned by a server answering a SUMMON message to
+ indicate that it is summoning that user.
+
+346 RPL_INVITELIST
+ "<channel> <invitemask>"
+347 RPL_ENDOFINVITELIST
+ "<channel> :End of channel invite list"
+
+ - When listing the 'invitations masks' for a given channel,
+ a server is required to send the list back using the
+ RPL_INVITELIST and RPL_ENDOFINVITELIST messages. A
+ separate RPL_INVITELIST is sent for each active mask.
+ After the masks have been listed (or if none present) a
+ RPL_ENDOFINVITELIST MUST be sent.
+
+348 RPL_EXCEPTLIST
+ "<channel> <exceptionmask>"
+349 RPL_ENDOFEXCEPTLIST
+ "<channel> :End of channel exception list"
+
+ - When listing the 'exception masks' for a given channel,
+ a server is required to send the list back using the
+ RPL_EXCEPTLIST and RPL_ENDOFEXCEPTLIST messages. A
+ separate RPL_EXCEPTLIST is sent for each active mask.
+ After the masks have been listed (or if none present)
+ a RPL_ENDOFEXCEPTLIST MUST be sent.
+
+351 RPL_VERSION
+ "<version>.<debuglevel> <server> :<comments>"
+
+ - Reply by the server showing its version details.
+ The <version> is the version of the software being
+ used (including any patchlevel revisions) and the
+ <debuglevel> is used to indicate if the server is
+ running in "debug mode".
+
+ The "comments" field may contain any comments about
+ the version or further version details.
+
+352 RPL_WHOREPLY
+ "<channel> <user> <host> <server> <nick>
+ ( "H" / "G" > ["*"] [ ( "@" / "+" ) ]
+ :<hopcount> <real name>"
+
+315 RPL_ENDOFWHO
+ "<name> :End of WHO list"
+
+ - The RPL_WHOREPLY and RPL_ENDOFWHO pair are used
+ to answer a WHO message. The RPL_WHOREPLY is only
+ sent if there is an appropriate match to the WHO
+ query. If there is a list of parameters supplied
+ with a WHO message, a RPL_ENDOFWHO MUST be sent
+ after processing each list item with <name> being
+ the item.
+
+353 RPL_NAMREPLY
+ "( "=" / "*" / "@" ) <channel>
+ :[ "@" / "+" ] <nick> *( " " [ "@" / "+" ] <nick> )
+ - "@" is used for secret channels, "*" for private
+ channels, and "=" for others (public channels).
+
+366 RPL_ENDOFNAMES
+ "<channel> :End of NAMES list"
+
+ - To reply to a NAMES message, a reply pair consisting
+ of RPL_NAMREPLY and RPL_ENDOFNAMES is sent by the
+ server back to the client. If there is no channel
+ found as in the query, then only RPL_ENDOFNAMES is
+ returned. The exception to this is when a NAMES
+ message is sent with no parameters and all visible
+ channels and contents are sent back in a series of
+ RPL_NAMEREPLY messages with a RPL_ENDOFNAMES to mark
+ the end.
+
+364 RPL_LINKS
+ "<mask> <server> :<hopcount> <server info>"
+365 RPL_ENDOFLINKS
+ "<mask> :End of LINKS list"
+
+ - In replying to the LINKS message, a server MUST send
+ replies back using the RPL_LINKS numeric and mark the
+ end of the list using an RPL_ENDOFLINKS reply.
+
+367 RPL_BANLIST
+ "<channel> <banmask>"
+368 RPL_ENDOFBANLIST
+ "<channel> :End of channel ban list"
+
+ - When listing the active 'bans' for a given channel,
+ a server is required to send the list back using the
+ RPL_BANLIST and RPL_ENDOFBANLIST messages. A separate
+ RPL_BANLIST is sent for each active banmask. After the
+ banmasks have been listed (or if none present) a
+ RPL_ENDOFBANLIST MUST be sent.
+
+371 RPL_INFO
+ ":<string>"
+374 RPL_ENDOFINFO
+ ":End of INFO list"
+
+ - A server responding to an INFO message is required to
+ send all its 'info' in a series of RPL_INFO messages
+ with a RPL_ENDOFINFO reply to indicate the end of the
+ replies.
+
+375 RPL_MOTDSTART
+ ":- <server> Message of the day - "
+372 RPL_MOTD
+ ":- <text>"
+376 RPL_ENDOFMOTD
+ ":End of MOTD command"
+
+ - When responding to the MOTD message and the MOTD file
+ is found, the file is displayed line by line, with
+ each line no longer than 80 characters, using
+ RPL_MOTD format replies. These MUST be surrounded
+ by a RPL_MOTDSTART (before the RPL_MOTDs) and an
+ RPL_ENDOFMOTD (after).
+
+381 RPL_YOUREOPER
+ ":You are now an IRC operator"
+
+ - RPL_YOUREOPER is sent back to a client which has
+ just successfully issued an OPER message and gained
+ operator status.
+
+382 RPL_REHASHING
+ "<config file> :Rehashing"
+
+ - If the REHASH option is used and an operator sends
+ a REHASH message, an RPL_REHASHING is sent back to
+ the operator.
+
+383 RPL_YOURESERVICE
+ "You are service <servicename>"
+
+ - Sent by the server to a service upon successful
+ registration.
+
+391 RPL_TIME
+ "<server> :<string showing server's local time>"
+
+ - When replying to the TIME message, a server MUST send
+ the reply using the RPL_TIME format above. The string
+ showing the time need only contain the correct day and
+ time there. There is no further requirement for the
+ time string.
+
+392 RPL_USERSSTART
+ ":UserID Terminal Host"
+393 RPL_USERS
+ ":<username> <ttyline> <hostname>"
+394 RPL_ENDOFUSERS
+ ":End of users"
+395 RPL_NOUSERS
+ ":Nobody logged in"
+
+ - If the USERS message is handled by a server, the
+ replies RPL_USERSTART, RPL_USERS, RPL_ENDOFUSERS and
+ RPL_NOUSERS are used. RPL_USERSSTART MUST be sent
+ first, following by either a sequence of RPL_USERS
+ or a single RPL_NOUSER. Following this is
+ RPL_ENDOFUSERS.
+
+200 RPL_TRACELINK
+ "Link <version & debug level> <destination>
+ <next server> V<protocol version>
+ <link uptime in seconds> <backstream sendq>
+ <upstream sendq>"
+201 RPL_TRACECONNECTING
+ "Try. <class> <server>"
+202 RPL_TRACEHANDSHAKE
+ "H.S. <class> <server>"
+203 RPL_TRACEUNKNOWN
+ "???? <class> [<client IP address in dot form>]"
+204 RPL_TRACEOPERATOR
+ "Oper <class> <nick>"
+205 RPL_TRACEUSER
+ "User <class> <nick>"
+206 RPL_TRACESERVER
+ "Serv <class> <int>S <int>C <server>
+ <nick!user|*!*>@<host|server> V<protocol version>"
+207 RPL_TRACESERVICE
+ "Service <class> <name> <type> <active type>"
+208 RPL_TRACENEWTYPE
+ "<newtype> 0 <client name>"
+209 RPL_TRACECLASS
+ "Class <class> <count>"
+210 RPL_TRACERECONNECT
+ Unused.
+261 RPL_TRACELOG
+ "File <logfile> <debug level>"
+262 RPL_TRACEEND
+ "<server name> <version & debug level> :End of TRACE"
+
+ - The RPL_TRACE* are all returned by the server in
+ response to the TRACE message. How many are
+ returned is dependent on the TRACE message and
+ whether it was sent by an operator or not. There
+ is no predefined order for which occurs first.
+ Replies RPL_TRACEUNKNOWN, RPL_TRACECONNECTING and
+ RPL_TRACEHANDSHAKE are all used for connections
+ which have not been fully established and are either
+ unknown, still attempting to connect or in the
+ process of completing the 'server handshake'.
+ RPL_TRACELINK is sent by any server which handles
+ a TRACE message and has to pass it on to another
+ server. The list of RPL_TRACELINKs sent in
+ response to a TRACE command traversing the IRC
+ network should reflect the actual connectivity of
+ the servers themselves along that path.
+
+ RPL_TRACENEWTYPE is to be used for any connection
+ which does not fit in the other categories but is
+ being displayed anyway.
+ RPL_TRACEEND is sent to indicate the end of the list.
+
+211 RPL_STATSLINKINFO
+ "<linkname> <sendq> <sent messages>
+ <sent Kbytes> <received messages>
+ <received Kbytes> <time open>"
+
+ - reports statistics on a connection. <linkname>
+ identifies the particular connection, <sendq> is
+ the amount of data that is queued and waiting to be
+ sent <sent messages> the number of messages sent,
+ and <sent Kbytes> the amount of data sent, in
+ Kbytes. <received messages> and <received Kbytes>
+ are the equivalent of <sent messages> and <sent
+ Kbytes> for received data, respectively. <time
+ open> indicates how long ago the connection was
+ opened, in seconds.
+
+212 RPL_STATSCOMMANDS
+ "<command> <count> <byte count> <remote count>"
+
+ - reports statistics on commands usage.
+
+219 RPL_ENDOFSTATS
+ "<stats letter> :End of STATS report"
+
+242 RPL_STATSUPTIME
+ ":Server Up %d days %d:%02d:%02d"
+
+ - reports the server uptime.
+
+243 RPL_STATSOLINE
+ "O <hostmask> * <name>"
+
+ - reports the allowed hosts from where user may become IRC
+ operators.
+
+221 RPL_UMODEIS
+ "<user mode string>"
+
+ - To answer a query about a client's own mode,
+ RPL_UMODEIS is sent back.
+
+234 RPL_SERVLIST
+ "<name> <server> <mask> <type> <hopcount> <info>"
+
+235 RPL_SERVLISTEND
+ "<mask> <type> :End of service listing"
+
+ - When listing services in reply to a SERVLIST message,
+ a server is required to send the list back using the
+ RPL_SERVLIST and RPL_SERVLISTEND messages. A separate
+ RPL_SERVLIST is sent for each service. After the
+ services have been listed (or if none present) a
+ RPL_SERVLISTEND MUST be sent.
+
+251 RPL_LUSERCLIENT
+ ":There are <integer> users and <integer>
+ services on <integer> servers"
+252 RPL_LUSEROP
+ "<integer> :operator(s) online"
+253 RPL_LUSERUNKNOWN
+ "<integer> :unknown connection(s)"
+254 RPL_LUSERCHANNELS
+ "<integer> :channels formed"
+255 RPL_LUSERME
+ ":I have <integer> clients and <integer>
+ servers"
+
+ - In processing an LUSERS message, the server
+ sends a set of replies from RPL_LUSERCLIENT,
+ RPL_LUSEROP, RPL_USERUNKNOWN,
+ RPL_LUSERCHANNELS and RPL_LUSERME. When
+ replying, a server MUST send back
+ RPL_LUSERCLIENT and RPL_LUSERME. The other
+ replies are only sent back if a non-zero count
+ is found for them.
+
+256 RPL_ADMINME
+ "<server> :Administrative info"
+257 RPL_ADMINLOC1
+ ":<admin info>"
+258 RPL_ADMINLOC2
+ ":<admin info>"
+259 RPL_ADMINEMAIL
+ ":<admin info>"
+
+ - When replying to an ADMIN message, a server
+ is expected to use replies RPL_ADMINME
+ through to RPL_ADMINEMAIL and provide a text
+ message with each. For RPL_ADMINLOC1 a
+ description of what city, state and country
+ the server is in is expected, followed by
+ details of the institution (RPL_ADMINLOC2)
+
+ and finally the administrative contact for the
+ server (an email address here is REQUIRED)
+ in RPL_ADMINEMAIL.
+
+263 RPL_TRYAGAIN
+ "<command> :Please wait a while and try again."
+
+ - When a server drops a command without processing it,
+ it MUST use the reply RPL_TRYAGAIN to inform the
+ originating client.
+
+401 ERR_NOSUCHNICK
+ "<nickname> :No such nick/channel"
+
+ - Used to indicate the nickname parameter supplied to a
+ command is currently unused.
+
+402 ERR_NOSUCHSERVER
+ "<server name> :No such server"
+
+ - Used to indicate the server name given currently
+ does not exist.
+
+403 ERR_NOSUCHCHANNEL
+ "<channel name> :No such channel"
+
+ - Used to indicate the given channel name is invalid.
+
+404 ERR_CANNOTSENDTOCHAN
+ "<channel name> :Cannot send to channel"
+
+ - Sent to a user who is either (a) not on a channel
+ which is mode +n or (b) not a chanop (or mode +v) on
+ a channel which has mode +m set or where the user is
+ banned and is trying to send a PRIVMSG message to
+ that channel.
+
+405 ERR_TOOMANYCHANNELS
+ "<channel name> :You have joined too many channels"
+
+ - Sent to a user when they have joined the maximum
+ number of allowed channels and they try to join
+ another channel.
+
+406 ERR_WASNOSUCHNICK
+ "<nickname> :There was no such nickname"
+
+ - Returned by WHOWAS to indicate there is no history
+ information for that nickname.
+
+407 ERR_TOOMANYTARGETS
+ "<target> :<error code> recipients. <abort message>"
+
+ - Returned to a client which is attempting to send a
+ PRIVMSG/NOTICE using the user@host destination format
+ and for a user@host which has several occurrences.
+
+ - Returned to a client which trying to send a
+ PRIVMSG/NOTICE to too many recipients.
+
+ - Returned to a client which is attempting to JOIN a safe
+ channel using the shortname when there are more than one
+ such channel.
+
+408 ERR_NOSUCHSERVICE
+ "<service name> :No such service"
+
+ - Returned to a client which is attempting to send a SQUERY
+ to a service which does not exist.
+
+409 ERR_NOORIGIN
+ ":No origin specified"
+
+ - PING or PONG message missing the originator parameter.
+
+411 ERR_NORECIPIENT
+ ":No recipient given (<command>)"
+412 ERR_NOTEXTTOSEND
+ ":No text to send"
+413 ERR_NOTOPLEVEL
+ "<mask> :No toplevel domain specified"
+414 ERR_WILDTOPLEVEL
+ "<mask> :Wildcard in toplevel domain"
+415 ERR_BADMASK
+ "<mask> :Bad Server/host mask"
+
+ - 412 - 415 are returned by PRIVMSG to indicate that
+ the message wasn't delivered for some reason.
+ ERR_NOTOPLEVEL and ERR_WILDTOPLEVEL are errors that
+ are returned when an invalid use of
+ "PRIVMSG $<server>" or "PRIVMSG #<host>" is attempted.
+
+421 ERR_UNKNOWNCOMMAND
+ "<command> :Unknown command"
+
+ - Returned to a registered client to indicate that the
+ command sent is unknown by the server.
+
+422 ERR_NOMOTD
+ ":MOTD File is missing"
+
+ - Server's MOTD file could not be opened by the server.
+
+423 ERR_NOADMININFO
+ "<server> :No administrative info available"
+
+ - Returned by a server in response to an ADMIN message
+ when there is an error in finding the appropriate
+ information.
+
+424 ERR_FILEERROR
+ ":File error doing <file op> on <file>"
+
+ - Generic error message used to report a failed file
+ operation during the processing of a message.
+
+431 ERR_NONICKNAMEGIVEN
+ ":No nickname given"
+
+ - Returned when a nickname parameter expected for a
+ command and isn't found.
+
+432 ERR_ERRONEUSNICKNAME
+ "<nick> :Erroneous nickname"
+
+ - Returned after receiving a NICK message which contains
+ characters which do not fall in the defined set. See
+ section 2.3.1 for details on valid nicknames.
+
+433 ERR_NICKNAMEINUSE
+ "<nick> :Nickname is already in use"
+
+ - Returned when a NICK message is processed that results
+ in an attempt to change to a currently existing
+ nickname.
+
+436 ERR_NICKCOLLISION
+ "<nick> :Nickname collision KILL from <user>@<host>"
+
+ - Returned by a server to a client when it detects a
+ nickname collision (registered of a NICK that
+ already exists by another server).
+
+437 ERR_UNAVAILRESOURCE
+ "<nick/channel> :Nick/channel is temporarily unavailable"
+
+ - Returned by a server to a user trying to join a channel
+ currently blocked by the channel delay mechanism.
+
+ - Returned by a server to a user trying to change nickname
+ when the desired nickname is blocked by the nick delay
+ mechanism.
+
+441 ERR_USERNOTINCHANNEL
+ "<nick> <channel> :They aren't on that channel"
+
+ - Returned by the server to indicate that the target
+ user of the command is not on the given channel.
+
+442 ERR_NOTONCHANNEL
+ "<channel> :You're not on that channel"
+
+ - Returned by the server whenever a client tries to
+ perform a channel affecting command for which the
+ client isn't a member.
+
+443 ERR_USERONCHANNEL
+ "<user> <channel> :is already on channel"
+
+ - Returned when a client tries to invite a user to a
+ channel they are already on.
+
+444 ERR_NOLOGIN
+ "<user> :User not logged in"
+
+ - Returned by the summon after a SUMMON command for a
+ user was unable to be performed since they were not
+ logged in.
+
+445 ERR_SUMMONDISABLED
+ ":SUMMON has been disabled"
+
+ - Returned as a response to the SUMMON command. MUST be
+ returned by any server which doesn't implement it.
+
+446 ERR_USERSDISABLED
+ ":USERS has been disabled"
+
+ - Returned as a response to the USERS command. MUST be
+ returned by any server which does not implement it.
+
+451 ERR_NOTREGISTERED
+ ":You have not registered"
+
+ - Returned by the server to indicate that the client
+ MUST be registered before the server will allow it
+ to be parsed in detail.
+
+461 ERR_NEEDMOREPARAMS
+ "<command> :Not enough parameters"
+
+ - Returned by the server by numerous commands to
+ indicate to the client that it didn't supply enough
+ parameters.
+
+462 ERR_ALREADYREGISTRED
+ ":Unauthorized command (already registered)"
+
+ - Returned by the server to any link which tries to
+ change part of the registered details (such as
+ password or user details from second USER message).
+
+463 ERR_NOPERMFORHOST
+ ":Your host isn't among the privileged"
+
+ - Returned to a client which attempts to register with
+ a server which does not been setup to allow
+ connections from the host the attempted connection
+ is tried.
+
+464 ERR_PASSWDMISMATCH
+ ":Password incorrect"
+
+ - Returned to indicate a failed attempt at registering
+ a connection for which a password was required and
+ was either not given or incorrect.
+
+465 ERR_YOUREBANNEDCREEP
+ ":You are banned from this server"
+
+ - Returned after an attempt to connect and register
+ yourself with a server which has been setup to
+ explicitly deny connections to you.
+
+466 ERR_YOUWILLBEBANNED
+
+ - Sent by a server to a user to inform that access to the
+ server will soon be denied.
+
+467 ERR_KEYSET
+ "<channel> :Channel key already set"
+471 ERR_CHANNELISFULL
+ "<channel> :Cannot join channel (+l)"
+472 ERR_UNKNOWNMODE
+ "<char> :is unknown mode char to me for <channel>"
+473 ERR_INVITEONLYCHAN
+ "<channel> :Cannot join channel (+i)"
+474 ERR_BANNEDFROMCHAN
+ "<channel> :Cannot join channel (+b)"
+475 ERR_BADCHANNELKEY
+ "<channel> :Cannot join channel (+k)"
+476 ERR_BADCHANMASK
+ "<channel> :Bad Channel Mask"
+477 ERR_NOCHANMODES
+ "<channel> :Channel doesn't support modes"
+478 ERR_BANLISTFULL
+ "<channel> <char> :Channel list is full"
+
+481 ERR_NOPRIVILEGES
+ ":Permission Denied- You're not an IRC operator"
+
+ - Any command requiring operator privileges to operate
+ MUST return this error to indicate the attempt was
+ unsuccessful.
+
+482 ERR_CHANOPRIVSNEEDED
+ "<channel> :You're not channel operator"
+
+ - Any command requiring 'chanop' privileges (such as
+ MODE messages) MUST return this error if the client
+ making the attempt is not a chanop on the specified
+ channel.
+
+483 ERR_CANTKILLSERVER
+ ":You can't kill a server!"
+
+ - Any attempts to use the KILL command on a server
+ are to be refused and this error returned directly
+ to the client.
+
+484 ERR_RESTRICTED
+ ":Your connection is restricted!"
+
+ - Sent by the server to a user upon connection to indicate
+ the restricted nature of the connection (user mode "+r").
+
+485 ERR_UNIQOPPRIVSNEEDED
+ ":You're not the original channel operator"
+
+ - Any MODE requiring "channel creator" privileges MUST
+ return this error if the client making the attempt is not
+ a chanop on the specified channel.
+
+491 ERR_NOOPERHOST
+ ":No O-lines for your host"
+
+ - If a client sends an OPER message and the server has
+ not been configured to allow connections from the
+ client's host as an operator, this error MUST be
+ returned.
+
+501 ERR_UMODEUNKNOWNFLAG
+ ":Unknown MODE flag"
+
+ - Returned by the server to indicate that a MODE
+ message was sent with a nickname parameter and that
+ the a mode flag sent was not recognized.
+
+502 ERR_USERSDONTMATCH
+ ":Cannot change mode for other users"
+
+ - Error sent to any user trying to view or change the
+ user mode for a user other than themselves.
+