> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-parallel-read-in-order-multi-part.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Network ports

> Description of available network ports and what they're used for

<Note>
  Ports described as **default** mean that the port number is configured in `/etc/clickhouse-server/config.xml`.  To customize your settings, add a file to `/etc/clickhouse-server/config.d/`.  See the [configuration file](/concepts/features/configuration/server-config/configuration-files) documentation.
</Note>

| Port | Description | Cloud | OSS |
| - | - | - | - |
| 2181 | ZooKeeper default service port. **Note: see `9181` for ClickHouse Keeper** | | ✓ |
| 8123 | HTTP default port | | ✓ |
| 8443 | HTTP SSL/TLS default port | ✓ | ✓ |
| 9000 | Native Protocol port (also referred to as ClickHouse TCP protocol). Used by ClickHouse applications and processes like `clickhouse-server`, `clickhouse-client`, and native ClickHouse tools. Used for inter-server communication for distributed queries. | | ✓ |
| 9004 | MySQL emulation port | | ✓ |
| 9005 | PostgreSQL emulation port (also used for secure communication if SSL is enabled for ClickHouse). | | ✓ |
| 9009 | Inter-server communication port for low-level data access. Used for data exchange, replication, and inter-server communication. | | ✓ |
| 9010 | SSL/TLS for inter-server communications | | ✓ |
| 9011 | Native protocol PROXYv1 protocol port | | ✓ |
| 9019 | JDBC bridge | | ✓ |
| 9100 | gRPC port | | ✓ |
| 9181 | Recommended ClickHouse Keeper port | | ✓ |
| 9234 | Recommended ClickHouse Keeper Raft port (also used for secure communication if `<secure>1</secure>` enabled) | | ✓ |
| 9363 | Prometheus default metrics port | | ✓ |
| 9281 | Recommended Secure SSL ClickHouse Keeper port | | ✓ |
| 9440 | Native protocol SSL/TLS port | ✓ | ✓ |
| 42000 | Graphite default port | | ✓ |