# WHATPORT(4004)

## NAME

port 4004 — pxc-roid (IANA registration) — Registered as pxc-roid and essentially never seen; an open 4004 is an application that chose the number.

Protocol: TCP  
IANA registry

## DESCRIPTION

4004 is registered to IANA as pxc-roid, part of the same undocumented pxc-* block as 4002–4007, with no reference, contact or protocol specification attached. No widely deployed software uses it as a default listener. If you find it open, the honest next step is to fingerprint the banner rather than trust the registry name.

## EXPOSURE

**Expose with care.** Nothing standard lives here, so exposure depends entirely on the unidentified service that answers.

## CHECK

```sh
nc -vz -w 3 TARGET 4004
```

## SEE ALSO

- iana — [IANA port registry — 4004 (pxc-roid)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=4004) (iana.org)

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HTML: <https://whatport.net/4004/> · JSON: <https://whatport.net/4004.json> · full dataset: <https://whatport.net/ports.json>