6667
IRC (Internet Relay Chat)
High RiskTCP — Messaging
Port Overview
Port Number
6667
Service Name
IRC (Internet Relay Chat)
Transport Protocol
TCP
Category
Messaging
Security Risk
High
Port Range
Registered (1024-49151)
What is Port 6667?
Port 6667 is the standard port for IRC (Internet Relay Chat), one of the oldest internet communication protocols still in use. IRC servers listen on this port for client connections to join channels and exchange messages. IRC is commonly associated with malware command-and-control (C2) communication and botnets in security contexts.
TCP
Messaging
Commonly Used
Security Considerations
Port 6667 (IRC (Internet Relay Chat)) is classified as high risk. This port is a common target for automated scanning and brute-force attacks. If you must expose it, restrict access to known IP addresses.
Recommendation: Use firewall rules to whitelist trusted IPs. Enable rate limiting and intrusion detection.