# WHATPORT(17877)

## NAME

port 17877 — Unassigned — Unregistered with no documented service; it is in Nmap's default scan set on frequency data alone.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA has no assignment for 17877 and Nmap carries no name for it, yet it ranks inside Nmap's default top-1000 TCP ports because scans encounter it open. No mainstream product documents it as a default listener, and nearby ports in the 17870-17890 range are unassigned as well. An open 17877 tells you a process chose that number, nothing more.

## EXPOSURE

**Expose with care.** Unknown service, so no defensible verdict from the port alone. Version-scan it and attribute it to a process before deciding whether it should be reachable.

## CHECK

```sh
nmap -Pn -sV -p 17877 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 services frequency database](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/17877/> · JSON: <https://whatport.net/17877.json> · full dataset: <https://whatport.net/ports.json>