# WHATPORT(9011)

## NAME

port 9011 — Reserved (TCP); D-Star routing (UDP) — IANA reserves 9011/tcp and assigns 9011/udp to amateur-radio D-Star routing.

Protocol: TCP  
IANA registry

## DESCRIPTION

The registry marks 9011/tcp as Reserved — deliberately held back, not available for assignment — while 9011/udp is d-star, "D-Star Routing digital voice+data for amateur radio". So the interesting traffic on this number is UDP and belongs to ham radio gateways. A TCP listener on 9011 is therefore something local and unregistered; find the process.

## EXPOSURE

**Expose with care.** For a D-Star gateway the UDP side is meant to reach other gateways; a TCP listener here is unexplained until you identify it.

## CHECK

```sh
sudo lsof -nP -iTCP:9011 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 9011](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=9011) (iana.org)

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HTML: <https://whatport.net/9011/> · JSON: <https://whatport.net/9011.json> · full dataset: <https://whatport.net/ports.json>