# WHATPORT(5730)

## NAME

port 5730 — unieng (Steltor calendar access) — An old calendar-server registration; nothing in current use listens here.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA assigns 5730 to unieng, described in the registry as "Steltor's calendar access". Steltor was a calendar-software vendor and the registration dates from that product's lifetime; no widely deployed software uses this port today. An open 5730 in 2026 is an application that chose the number for itself, not the registered service, so confirm it by process.

## EXPOSURE

**Expose with care.** An unidentified listener on a port with a defunct registration. Establish what owns it before allowing anything to reach it.

## CHECK

```sh
sudo lsof -nP -iTCP:5730 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA port registry — 5730 (unieng)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=5730) (iana.org)

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HTML: <https://whatport.net/5730/> · JSON: <https://whatport.net/5730.json> · full dataset: <https://whatport.net/ports.json>