# WHATPORT(55600)

## NAME

port 55600 — Unassigned (dynamic range) — Unregistered, unnamed, and near the top of the obscure-high-port frequency band.

Protocol: TCP  
IANA registry

## DESCRIPTION

55600 carries no IANA assignment, since RFC 6335 excludes the whole 49152-65535 range from registration. Nmap's nmap-services lists it "unknown" at 0.000760 for TCP and 0.000502 for UDP — a comparatively high figure that puts it comfortably inside the default top-1000 scan, but says nothing about what is behind it. SANS ISC records probes against it with no service name attached. That is the entire documented record.

## EXPOSURE

**Expose with care.** A relatively high observed-open rate makes this a port scanners will try. Do not leave an unidentified service on it facing the internet.

## CHECK

```sh
nc -vz -w 3 TARGET 55600
```

## 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 55600](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=55600) (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/55600/> · JSON: <https://whatport.net/55600.json> · full dataset: <https://whatport.net/ports.json>