The top of IANA's 6665-6669 IRC range — a plaintext alternate to 6667.
6669 is the last port in the ircu block IANA assigned for IRC, and servers that listen across the range include it so clients have a fifth fallback. The protocol is identical to 6667: CRLF-terminated text commands, numeric replies, no encryption. Nothing else of note is registered here, so an open 6669 is an IRC daemon or an application squatting on a free port.
Expose with care
Plaintext like the rest of the range. Offer 6697 with TLS alongside it if the server is public.
$ printf 'QUIT\r\n' | nc -v TARGET 6669Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.