[BAILOPAN]

The protocols used to query are well-documented by Valve in case you want to make your own query tools.

HL1:
/**
* Resources:
* http://developer.valvesoftware.com/w...Query_Protocol
* http://developer.valvesoftware.com/wiki/Server_Queries
* http://www.valve-erc.com/srcsdk/Code...erqueries.html
* server_protocol.txt from HL1SDK
*/


HL2:
/**
* Resources:
* http://developer.valvesoftware.com/w...Query_Protocol
* http://developer.valvesoftware.com/wiki/Server_Queries
* http://www.valve-erc.com/srcsdk/Code...erqueries.html
*/