# WHATPORT(15742)

## NAME

port 15742 — Unassigned — No IANA assignment and no documented default service — an open 15742 is something you have to identify yourself.

Protocol: TCP  
IANA registry

## DESCRIPTION

15742 is unassigned in the IANA registry and carries no service name in Nmap's services database. It is in Nmap's default top-1000 TCP set purely because empirical scan data shows it open often enough to be worth probing, not because any known software claims it. Nearby 15740 is registered as PTP (Picture Transfer Protocol over TCP/IP), but that says nothing about 15742. In practice a listener here is an application-chosen high port: a container publish, a proxy, or an internal service someone numbered arbitrarily.

## EXPOSURE

**Expose with care.** The finding is the unknown listener itself. Identify the process before deciding anything — an unrecognized high port on a public interface is worth treating as suspicious until it is named.

## CHECK

```sh
sudo lsof -nP -iTCP:15742 -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 frequency database](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/15742/> · JSON: <https://whatport.net/15742.json> · full dataset: <https://whatport.net/ports.json>