Master Server Query Protocol: Difference between revisions
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Revision as of 13:32, 12 June 2006
Send the following UDP query to a master server to get a list of Source host servers.
Format
| Type | Field | Value |
|---|---|---|
| Byte | Message Type | 0x31 - the character "1" |
| Byte | Region Code | See below |
| String Zero | IP:Port | See below |
| String Zero | Filter | See below |
Region Codes
The region of the world that you wish to find servers in.
| Byte | Description |
|---|---|
| 0x00 | US East coast |
| 0x01 | US West coast |
| 0x02 | South America |
| 0x03 | Europe |
| 0x04 | Asia |
| 0x05 | Australia |
| 0x06 | Middle East |
| 0x07 | Africa |
| 0xFF | Rest of the world |
IP:Port
The first IP:Port Steam sends is "0.0.0.0:0".
From then on, IP:Port becomes the last IP and Port received in the master servers reply. This allows steam to then grab another list of more servers.
Filter
Allows you to restrict the results to servers running a certain game, map, etc.
Send an empty string (0x00) to recieve a list of all types of servers.
Insert \ in between filter parameters
\type\d
- Servers running dedicated
\secure\1
- Servers using anti-cheat technology (VAC)
\gamedir\[mod]
- Servers running the specified modification (ex. cstrike)
\map\[map]
- Servers running the specified map (ex. cs_italy)
\linux\1
- Servers running on a Linux platform
\empty\1
- Servers that are not empty
\full\1
- Servers that are not full
\proxy\1
- Servers that are spectator proxies
Master Servers
Current master servers are
- 69.28.151.162:27010
- 207.173.177.11:27010
- 68.142.72.250:27010
- 68.142.72.250:27011
- 69.28.151.162:27011
- 207.173.177.12:27012
- 207.173.177.11:27012
- 69.28.151.162:27010
If you can, get your application to check the file Steam\config\masterservers.vdf to get the latest list of master servers.
Reply Format
The reply always starts with FF FF FF FF 66 0A.
The format is then a series of these server address blocks:
| Type | Data |
|---|---|
| Byte | First octet of IP address |
| Byte | Second octet of IP address |
| Byte | Third octet of IP address |
| Byte | Fourth octet of IP address |
| Unsigned Short | Port number - usually 27015 (69 87) - this is network ordered, which is unlike every other Steam protocol.
|
Some of the servers may be unreachable, so query each server directly to find out. Note also that this list is not exhaustive, so if you're looking for a particular type of server make sure that you specify a filter with the query, rather than filtering client side.