The client sends out a token handshake to the hardcodet range of lan ports. But it only has one variable to store the token in. https://github.com/teeworlds/teeworlds/blob/c56fa9e6a20cfc9d7d16502e18c7d7633acdf492/src/engine/client/serverbrowser.cpp#L79 So only one server gets the correct token and will reply.