194
Real-time group chat protocol (IRC) — official IANA port
Internet Relay Chat
What is port 194?
IRC (Internet Relay Chat) on port 194 is one of the oldest real-time communication protocols, enabling text-based group chat in channels. In practice, most IRC servers use port 6667 (unencrypted) or 6697 (SSL/TLS); port 194 is the official IANA-assigned port but is rarely used. IRC remains popular in open source communities such as Libera.Chat and OFTC.
Quick checks
$
nc -zv example.com 194
$
nmap -p 194 example.com
$
telnet example.com 194