# WHATPORT(2251)

## NAME

port 2251 — Distributed Framework Port — An IANA registration with no public protocol behind it.

Protocol: TCP  
IANA: dif-port

## DESCRIPTION

IANA registers 2251 as dif-port, "Distributed Framework Port". No specification was published with the registration and no commonly deployed software defaults here, so the entry is a reserved name rather than a protocol you will meet on a scan. A listener on 2251 is best identified by process, not by the registry.

## EXPOSURE

**Expose with care.** Unknown service: find out what bound the port and whether it authenticates before exposing anything.

## CHECK

```sh
sudo lsof -nP -iTCP:2251 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 2251 (dif-port)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=2251) (iana.org)

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HTML: <https://whatport.net/2251/> · JSON: <https://whatport.net/2251.json> · full dataset: <https://whatport.net/ports.json>