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194,6667,6660-7000 - Pentesting IRC

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Basic Information

IRC, initially a plain text protocol, was assigned 194/TCP by IANA but is commonly run on 6667/TCP and similar ports to avoid needing root privileges for operation.

A nickname is all that's needed to connect to a server. Following connection, the server performs a reverse-DNS lookup on the user's IP.

Users are divided into operators, who need a username and password for more access, and regular users. Operators have varying levels of privileges, with administrators at the top.

Default ports: 194, 6667, 6660-7000

PORT     STATE SERVICE
6667/tcp open  irc

Enumeration

IRC can support TLS.

nc -vn <IP> <PORT>
openssl s_client -connect <IP>:<PORT> -quiet

Manual

Here you can see how to connect and access the IRC using some random nickname and then enumerate some interesting info. You can learn more commands of IRC here.

You can, also, atttempt to login to the server with a password. The default password for ngIRCd is wealllikedebian.

Find and scan IRC services

Brute Force

Shodan

  • looking up your hostname

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