Port 6667 · IRC

Port 6667 is IRC, TCP.

Internet Relay Chat — legitimate chat protocol, but historically a primary C2 channel for botnets.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-6667 protocol tcp port 6667

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application irc service tcp-6667 action allow

Risk and exposure

Rated high risk. Services on this port are commonly targeted by attackers. Keep it off the internet, or put it behind a VPN or a strict source allow-list, and monitor access.

Check it

• Linux ss -tlnp | grep :6667
• PowerShell Test-NetConnection <host> -Port 6667
• nmap nmap -p 6667 <host>

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• 4445 Metasploit Alt
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