# WHATPORT(19801)

## NAME

port 19801 — Unassigned — Unassigned by IANA, no known service — it is in Nmap's default scan list only because hosts answer there.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA lists 19801 inside the unassigned block 19791-19997, so no vendor has ever claimed it. Nmap's service table carries it with an open-frequency but the label 'unknown', which is why it lands in the default top-1000 TCP scan and shows up in reports. In practice anything listening here is a private application, a container port mapping, or a service someone moved off its normal port. Identify the listener before you assume anything about it.

## EXPOSURE

**Expose with care.** The verdict belongs to whatever is actually bound here, not to the number. Fingerprint it first; an unidentified listener on a public IP is a finding, not a service.

## CHECK

```sh
nmap -Pn -sV -p 19801 --reason TARGET
```

## 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 nmap-services frequency table](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/19801/> · JSON: <https://whatport.net/19801.json> · full dataset: <https://whatport.net/ports.json>