Use the Search, Luke!
For example, I found back a thread: https://forum.processing.org/topic/processing-and-irc
where my advice at the time is still valid...

Well I was wondering if Processing had access to IRC natively but whatever!

In short, no, it offers a Network library, but no IRC, POP3, IMAP4, SMTP or other protocol support (beside HTTP). You have to use Java libraries for that.