> ## Documentation Index
> Fetch the complete documentation index at: https://docs.polygon.technology/llms.txt
> Use this file to discover all available pages before exploring further.

# Default ports for nodes

> Reference for default ports used by Bor and Heimdall nodes on Polygon PoS.

## Bor node

| Name                   | Port  | Tags                      | Description                                                                                         |
| ---------------------- | ----- | ------------------------- | --------------------------------------------------------------------------------------------------- |
| Network Listening Port | 30303 | Public                    | Port used by Bor for peer connections and synchronization.                                          |
| RPC Server             | 8545  | Can be Public, Internal   | RPC port for sending transactions and fetching data. Heimdall uses this port to obtain Bor headers. |
| WebSocket Server       | 8546  | Can be Public, Internal   | WebSocket port for real-time updates.                                                               |
| GraphQL Server         | 8547  | Internal                  | GraphQL port for querying data.                                                                     |
| Prometheus Server      | 9091  | Can be Public, Monitoring | Prometheus APIs for Grafana data source. Can be mapped to ports 80/443 via an Nginx reverse proxy.  |
| Grafana Server         | 3001  | Can be Public, Monitoring | Grafana web server. Can be mapped to ports 80/443 via an Nginx reverse proxy.                       |
| Pprof Server           | 7071  | Internal, Monitoring      | Pprof server for collecting Bor metrics.                                                            |
| UDP Discovery          | 30301 | Can be Public, Internal   | Default port for Bootnode peer discovery.                                                           |

## Heimdall node

| Name                   | Port  | Tags                    | Description                                                                                        |
| ---------------------- | ----- | ----------------------- | -------------------------------------------------------------------------------------------------- |
| Network Listening Port | 26656 | Public                  | Port used by Heimdall for peer connections and synchronization.                                    |
| RPC Server             | 1317  | Can be Public, Internal | RPC port for sending transactions and fetching data. Bor uses this port to interact with Heimdall. |