# WHATPORT(3003)

## NAME

port 3003 — cgms (registered) — Registered to IANA as CGMS, with nothing public describing it.

Protocol: TCP/UDP  
IANA: cgms

## DESCRIPTION

IANA lists 3003 for TCP and UDP as cgms, "CGMS", with an individual assignee and no reference document. No specification, vendor page, or open implementation is publicly identifiable, and the port is rare in scan data. In practice a listener on 3003 is an application that took a free port near 3000, not the registered service.

## EXPOSURE

**Expose with care.** Identify the actual process before deciding anything — the registration tells you nothing about what is listening.

## CHECK

```sh
sudo lsof -nP -iTCP:3003 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 3003 (cgms)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3003) (iana.org)

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HTML: <https://whatport.net/3003/> · JSON: <https://whatport.net/3003.json> · full dataset: <https://whatport.net/ports.json>