Client-to-client Protocol - Structure

Structure

A CTCP message is implemented as a PRIVMSG or NOTICE where the first and last characters of the message are ASCII value 0x01. Additionally, characters which would not be allowed in the IRC protocol are escaped. Since a NOTICE as the standard should not generate another NOTICE as a reply, CTCP messages are sent as PRIVMSG and the reply is implemented with a NOTICE instead of a PRIVMSG.

A CTCP query is initiated on most clients as follows:

CTCP

Where is the target nickname or channel, is the CTCP command (e.g. VERSION), and are additional information to be sent to sent to the .

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