[terminalcommand]

Ircdocs.horse is an excellent resource but it is unfortunately not complete.

Irc also has a lot of -to me at least- obscure specifications for example involving channel modes. The functionality differs from server to server.

I have the impression that most irc servers are operated by programs with old codebases coded in C. New client implementations are continuing to get written, but I do not see a lot of server implementations around, probably because it is complicated to write.