Registered to an old conference-control tool, but today it is usually a Mesos master's HTTP API and web UI.
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.
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.
$ curl -s http://TARGET:5050/state | head -c 400Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.