# WHATPORT(19842)

## NAME

port 19842 — Unassigned — Unassigned by IANA and unnamed in Nmap's table — a top-1000 scan port with no service behind it.

Protocol: TCP  
IANA registry

## DESCRIPTION

19842 sits in the same unassigned IANA block as 19801 (19791-19997) and has no registration of any kind. Nmap records a nonzero open-frequency for it from internet-wide scanning, so it is included in the default 1000-port scan, but the service column reads 'unknown'. Anything found open here is site-specific: an in-house daemon, a relocated service, or a mapped container port. There is no protocol to describe.

## EXPOSURE

**Expose with care.** Judge the listener, not the port number. Run a version scan and decide from what actually answers.

## CHECK

```sh
nmap -Pn -sV -p 19842 --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/19842/> · JSON: <https://whatport.net/19842.json> · full dataset: <https://whatport.net/ports.json>