# WHATPORT(6504)

## NAME

port 6504 — Unassigned — Unassigned by IANA, immediately above the registered BoKS block.

Protocol: TCP  
IANA registry

## DESCRIPTION

The registry shows 6504 as unassigned. Its only context is the neighbourhood: 6500-6503 carry the BoKS access-control daemons, and a BoKS domain configured with a base port a few numbers higher would land traffic here. Nothing is registered or documented as owning 6504 itself, so a listener is either a shifted BoKS block or unrelated software that grabbed a free port.

## EXPOSURE

**Expose with care.** No registration to reason from — identify the process first. If it turns out to be a BoKS daemon, treat it as a control plane and keep it internal.

## CHECK

```sh
sudo lsof -nP -iTCP:6504 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 6504 unassigned](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6504) (iana.org)

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HTML: <https://whatport.net/6504/> · JSON: <https://whatport.net/6504.json> · full dataset: <https://whatport.net/ports.json>