# WHATPORT(1066)

## NAME

port 1066 — FPO-FNS — Registered as FPO-FNS; no public specification, and no reliable modern sighting.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

IANA assigns 1066 to `fpo-fns`, "FPO-FNS", a vendor registration with no published protocol documentation. Nmap sees it on about 0.19% of scanned hosts, which is typical background for this block and does not imply the registered service is what answered. Older port lists sometimes attach trojan names to ports in the 1000-1100 range; those attributions are undocumented folklore and are not repeated here. Identify the listener directly instead.

## EXPOSURE

**Expose with care.** Unknown service. Fingerprint the listener; nothing about this registration argues for exposing it.

## CHECK

```sh
nmap -Pn -sV -p 1066 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)

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HTML: <https://whatport.net/1066/> · JSON: <https://whatport.net/1066.json> · full dataset: <https://whatport.net/ports.json>