# WHATPORT(56738)

## NAME

port 56738 — Unassigned (dynamic range) — 56737's neighbour — same story: no registration, no named service.

Protocol: TCP  
IANA registry

## DESCRIPTION

56738 is in the Dynamic/Private range and therefore unassignable by IANA under RFC 6335. Nmap's nmap-services carries it as "unknown" at 0.000304, marginally above its neighbour 56737, which is why both survive into the default top-1000 TCP set. No public database names an application, protocol, or malware family for it. Adjacent pairs like this often come from one program binding consecutive ports, but no source confirms that here, so it stays a guess and not a finding.

## EXPOSURE

**Expose with care.** Unidentified listener. Do not open it inbound; identify what binds it and rate that instead.

## CHECK

```sh
nmap -Pn -sV --version-all -p 56738 TARGET
```

## SEE ALSO

- spec — [RFC 6335 — Dynamic Ports (49152-65535)](https://www.rfc-editor.org/rfc/rfc6335.html) (rfc-editor.org)
- iana — [IANA port registry — search 56738](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=56738) (iana.org)
- source — [nmap/nmap — nmap-services frequency data](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/56738/> · JSON: <https://whatport.net/56738.json> · full dataset: <https://whatport.net/ports.json>