# WHATPORT(9941)

## NAME

port 9941 — Unassigned — No IANA registration and no well-known service — whatever answers here is somebody's own application.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA has no service name assigned to 9941 in the service-name and port-number registry, and Nmap's service database lists it as unknown, open on roughly 0.015% of scanned hosts. That leaves no protocol you can assume from the number alone. In practice a listener on a port like this is an internal agent, a container port mapping, or an app that grabbed a free high number. Fingerprint the service instead of trusting the port.

## EXPOSURE

**Expose with care.** An unidentified listener is an unidentified authentication story. Find the process that owns the socket before deciding whether it belongs on a public interface.

## CHECK

```sh
sudo lsof -nP -iTCP:9941 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA port registry — 9941 (no assignment)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=9941) (iana.org)
- source — [nmap-services — Nmap's port frequency database](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/9941/> · JSON: <https://whatport.net/9941.json> · full dataset: <https://whatport.net/ports.json>