# WHATPORT(28201)

## NAME

port 28201 — Unassigned — The first number in an unassigned IANA block, unnamed in Nmap and unclaimed by any product.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA's unassigned range 28201-28239 begins at this port, so 28201 is registered to nobody. Nmap lists it as 'unknown' with a small open-frequency, enough to include it in the default 1000-port TCP scan. Nothing in the public record — vendor docs, RFCs, or malware reporting — associates it with a service. An open 28201 is a local decision someone made, and the banner is the only way to find out whose.

## EXPOSURE

**Expose with care.** Unknown by default. Identify the listener; an unexplained open port on a public IP deserves closing rather than documenting.

## CHECK

```sh
nmap -Pn -sV -p 28201 --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/28201/> · JSON: <https://whatport.net/28201.json> · full dataset: <https://whatport.net/ports.json>