# WHATPORT(5050)

## NAME

port 5050 — Apache Mesos master (registered as mmcc) — Registered to an old conference-control tool, but today it is usually a Mesos master's HTTP API and web UI.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

IANA lists 5050 as mmcc, a multimedia conference control tool from the early RTP era; Yahoo Messenger also squatted here for years before the service shut down in 2018. The live occupant now is Apache Mesos, whose master defaults to `--port=5050` for its HTTP endpoints and web UI, with agents on 5051. Hitting `http://host:5050/state` on a Mesos master returns the full cluster state as JSON.

## EXPOSURE

**Do not expose.** The Mesos master API is a cluster control plane and ships without authentication enabled, so an open 5050 hands over cluster topology and, with framework access, the ability to schedule tasks. Keep it on a management network.

## CHECK

```sh
curl -s http://TARGET:5050/state | head -c 400
```

## SEE ALSO

- docs — [Apache Mesos — Master and Agent Options (--port defaults)](https://mesos.apache.org/documentation/latest/configuration/master-and-agent/) (mesos.apache.org)
- source — [apache/mesos on GitHub](https://github.com/apache/mesos) (github.com)
- iana — [IANA port registry — 5050 (mmcc)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=5050) (iana.org)

---

HTML: <https://whatport.net/5050/> · JSON: <https://whatport.net/5050.json> · full dataset: <https://whatport.net/ports.json>