# WHATPORT(40911)

## NAME

port 40911 — Unassigned — Unregistered and rare — Nmap finds it open on roughly two hosts in ten thousand.

Protocol: TCP  
IANA registry

## DESCRIPTION

There is no IANA registration for 40911 and no service name in Nmap's database, which measures its open frequency at about 0.02%, near the bottom of the ports Nmap bothers to scan by default. Nothing conventional runs here, so an open port is either a bespoke service or an ephemeral socket in the Linux 32768-60999 range. The number itself tells you nothing.

## EXPOSURE

**Expose with care.** Rare and unidentified is not the same as harmless; fingerprint the listener before making any exposure decision.

## CHECK

```sh
nc -vz -w 3 TARGET 40911
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 40911](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=40911) (iana.org)
- source — [nmap/nmap — nmap-services (port frequency database)](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/40911/> · JSON: <https://whatport.net/40911.json> · full dataset: <https://whatport.net/ports.json>