# WHATPORT(9917)

## NAME

port 9917 — Unassigned — No IANA assignment and no established occupant — an application-chosen high port.

Protocol: TCP  
IANA registry

## DESCRIPTION

There is no IANA service registration for 9917 on TCP or UDP. Nmap records it as `unknown`, seen rarely enough that no pattern emerges. Nothing standard, nothing vendor-default, nothing notable in published malware writeups. Find the owning process rather than reading meaning into the number.

## EXPOSURE

**Expose with care.** An unidentified listener deserves scrutiny, not a default allow. Establish what it is, then decide.

## CHECK

```sh
sudo lsof -nP -iTCP:9917 -sTCP:LISTEN
```

## 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)

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HTML: <https://whatport.net/9917/> · JSON: <https://whatport.net/9917.json> · full dataset: <https://whatport.net/ports.json>