Twitch uses a bunch of go scripts wearing a trenchcoat masquerading as IRC.
It’s referred to as TMI which stands for “Twitch Messaging Interface” it’s not “IRC” it’s just “IRC compatible” and uses some/most of IRCv3 and the message structuring.
An example message:
@badge-info=subscriber/87;badges=moderator/1,subscriber/3084;color=#B22222;display-name=CohhilitionBot;emotes=;flags=;id=8c27edda-8c13-4de0-9338-f44ca18e6656;mod=1;room-id=26610234;subscriber=1;tmi-sent-ts=1617897093532;turbo=0;user-id=45522171;user-type=mod :cohhilitionbot!cohhilitionbot@cohhilitionbot.tmi.twitch.tv PRIVMSG #cohhcarnage :ACTION zzzz… zzz…zz… huh… huh? What?
Everyone’s host is set to the same format
username!username@username.tmi.twitch.tv