# WHATPORT(8540)

## NAME

port 8540 — Unassigned — No registration, no documented default — whatever is here was chosen locally.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA has no assignment for 8540 on either transport, and Nmap tracks it as "unknown" with an open rate near 0.015%. Nothing widely deployed documents it as a default port. As with the rest of the unregistered 8xxx range, an open 8540 tells you only that some process bound it.

## EXPOSURE

**Expose with care.** Treat it as an unidentified service and judge exposure by what the process actually is.

## CHECK

```sh
sudo lsof -nP -iTCP:8540 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) (iana.org)
- source — [nmap-services — Nmap port frequency data](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/8540/> · JSON: <https://whatport.net/8540.json> · full dataset: <https://whatport.net/ports.json>