# WHATPORT(9501)

## NAME

port 9501 — Swoole application server (unregistered) — Unassigned at IANA, but the port every Swoole PHP example listens on — so a PHP coroutine app server is the usual answer.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA has no assignment for 9501. In practice it is the number baked into Swoole's own documentation and README examples: `new Swoole\Http\Server('127.0.0.1', 9501)` and the matching WebSocket server. Swoole is a PHP extension that turns PHP into a long-running event-driven server, so a listener here is usually a Laravel Octane, Hyperf, or hand-rolled Swoole process that a copy-pasted example never renamed. Anything else on 9501 is an application picking a free high port.

## EXPOSURE

**Expose with care.** An app server, not a proxy — it usually has no TLS, no request-size limits, and no access logging of its own. Put it behind nginx or a load balancer and bind it to localhost.

## CHECK

```sh
curl -sI http://TARGET:9501/
```

## SEE ALSO

- source — [Swoole source repository (server examples use 9501)](https://github.com/swoole/swoole-src) (github.com)
- 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)

---

HTML: <https://whatport.net/9501/> · JSON: <https://whatport.net/9501.json> · full dataset: <https://whatport.net/ports.json>