# WHATPORT(15000)

## NAME

port 15000 — Envoy admin (in practice) / hydap (IANA) — Registered to HYPACK survey software; on any Kubernetes node it is the Envoy sidecar's admin interface.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA assigns 15000 to `hydap`, "Hypack Data Aquisition", used by HYPACK's hydrographic survey packages. Far more common today is Envoy: Istio documents 15000 as the "Envoy admin port (commands/diagnostics)" on every injected sidecar, alongside 15001 outbound, 15006 inbound, 15021 health and 15090 telemetry. The admin interface is a plain HTTP endpoint that dumps the proxy's full configuration and stats and can change log levels or drain listeners, which is why Istio marks it pod-internal only. Outside a mesh, 15000 is also a popular round number for application listeners.

## EXPOSURE

**Do not expose.** Envoy's own documentation warns the admin endpoint must not be exposed: `/config_dump` can reveal secrets and its handlers can modify or shut down the proxy. Bind it to localhost.

## CHECK

```sh
curl -s http://TARGET:15000/server_info
```

## SEE ALSO

- docs — [Envoy — administration interface](https://www.envoyproxy.io/docs/envoy/latest/operations/admin) (envoyproxy.io)
- docs — [Istio — ports used by Istio](https://istio.io/latest/docs/ops/deployment/application-requirements/) (istio.io)
- iana — [IANA port registry — 15000 (hydap)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=15000) (iana.org)

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