> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-fix-nav-issues.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                                                                                                                                                                                                                                      |       | ✓   |