</td><td>Health checks</td><td>No</td></tr><tr><td>15053</td><td>DNS</td><td>DNS port, if capture is enabled</td><td>Yes</td></tr><tr><td>15090</td><td>HTTP</td><td>Envoy Prometheus telemetry</td><td>No</td></tr></tbody></table><p>The following ports and protocols are used by the Istio control plane (istiod).</p><table><thead><tr><th>Port</th><th>Protocol</th><th>Description</th><th>Local host only</th></tr></thead><tbody><tr><td>443</td><td>HTTPS</td><td>Webhooks service port</td><td>No</td></tr><tr><td>80