# WHATPORT(5033)

## NAME

port 5033 — jtnetd-server — Registered as Janstor Secure Data — a vendor port you are unlikely to meet in the wild.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA assigns 5033/tcp to jtnetd-server, "Janstor Secure Data"; the UDP side is simply Reserved. There is no public specification and no widely deployed implementation, and scanners record it with a very low hit rate. If you find something on 5033 it is far more likely to be an unrelated application that chose the number than a Janstor deployment.

## EXPOSURE

**Expose with care.** Treat it as unknown: fingerprint the listener before exposing it, since the registration tells you nothing about its authentication or encryption.

## CHECK

```sh
sudo lsof -nP -iTCP:5033 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA port registry — 5033 (jtnetd-server)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=5033) (iana.org)

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HTML: <https://whatport.net/5033/> · JSON: <https://whatport.net/5033.json> · full dataset: <https://whatport.net/ports.json>