# WHATPORT(5431)

## NAME

port 5431 — PARK AGENT (park-agent) — Registered as PARK AGENT, but when it turns up it is usually a consumer router's own service.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

IANA has 5431 registered as park-agent on TCP and UDP, an old entry with no published protocol description. The registered service is effectively extinct. What people do report finding on 5431 is a listener on consumer broadband routers — Broadcom-based Belkin, Linksys, and D-Link gateways — that disappears when UPnP is switched off, which points at the gateway's UPnP IGD control service; no vendor documentation confirms the port, so treat that as a field observation.

## EXPOSURE

**Do not expose.** If this is your router answering, it is a device control surface — it must not be reachable from the WAN side.

## CHECK

```sh
curl -sS -o /dev/null -w '%{http_code}\n' http://TARGET:5431/
```

## SEE ALSO

- iana — [IANA port registry — 5431 (park-agent)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=5431) (iana.org)

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HTML: <https://whatport.net/5431/> · JSON: <https://whatport.net/5431.json> · full dataset: <https://whatport.net/ports.json>