All client-to-server IRC protocols in use today are descended from the protocol implemented in the irc2.4.0 version of the IRC2 server, and documented in RFC 1459.
Kõik praegu kasutusel olevad klient-server IRC protokollid pärinevad IRC2 serveri irc2.4.0 protokolli versioonist, mis on dokumenteeritud RFC 1459 -s.