# WHATPORT(6669)

## NAME

port 6669 — IRC (alternate) — The top of IANA's 6665-6669 IRC range — a plaintext alternate to 6667.

Protocol: TCP  
IANA registry

## DESCRIPTION

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.

## EXPOSURE

**Expose with care.** Plaintext like the rest of the range. Offer 6697 with TLS alongside it if the server is public.

## CHECK

```sh
printf 'QUIT\r\n' | nc -v TARGET 6669
```

## SEE ALSO

- spec — [RFC 1459 — Internet Relay Chat Protocol](https://www.rfc-editor.org/rfc/rfc1459.html) (rfc-editor.org)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 6665-6669 (ircu)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6669) (iana.org)

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HTML: <https://whatport.net/6669/> · JSON: <https://whatport.net/6669.json> · full dataset: <https://whatport.net/ports.json>