Registered to HYPACK survey software; on any Kubernetes node it is the Envoy sidecar's admin interface.
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.
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.
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