# WHATPORT(9099)

## NAME

port 9099 — Unassigned — Unregistered and uncommon — no standard service claims 9099.

Protocol: TCP  
IANA registry

## DESCRIPTION

Like its neighbour 9098, port 9099 carries no IANA registration and appears in nmap's services table only as unknown. Applications occasionally pick it as an arbitrary secondary listener, but there is no protocol you can assume from the number alone. Fingerprint the listener rather than guessing.

## EXPOSURE

**Expose with care.** Judge it by the service you find behind it; an unregistered port is not evidence of either safety or danger.

## CHECK

```sh
nmap -sV -Pn -p 9099 TARGET
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) (iana.org)
- source — [nmap-services (port frequency and name table)](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

---

HTML: <https://whatport.net/9099/> · JSON: <https://whatport.net/9099.json> · full dataset: <https://whatport.net/ports.json>