# Arma 3 Server Ports Reference (/docs/arma-3/server-ports)



Default Ports [#default-ports]

All ports are **UDP**:

| Port     | Offset | Purpose                            |
| -------- | ------ | ---------------------------------- |
| **2302** | +0     | Game port + Voice over Net (VON)   |
| **2303** | +1     | Steam query                        |
| **2304** | +2     | Steam master                       |
| **2305** | +3     | VON (reserved, not currently used) |
| **2306** | +4     | BattlEye traffic                   |

Changing the Base Port [#changing-the-base-port]

Set `-port=XXXX` in the startup parameters. All other ports shift automatically (+1 through +4).

Multiple Server Instances [#multiple-server-instances]

Leave at least **100 ports** between instances:

* Server 1: 2302–2306
* Server 2: 2402–2406
* Server 3: 2502–2506

Related Guides [#related-guides]

* [Server Configuration](/docs/arma-3/configure-your-server)
* [Connect to Your Server](/docs/arma-3/connect-to-your-server)