UT99.org | Unreal Tournament Community

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//128 = €
//   -> //charcode numbers // info
// A -> 128 0 0 0 // = map name and gametype
// B -> 128 0 0 1 // = servermode, admin, admin email, spec details mutators
// C -> 128 0 0 2 // looks like player names
// D -> 128 0 0 3 // looks like  B and C


// mapname and gametype
const buf = Buffer.from('\128\0\0\0', 'utf8');

// server mode, admin details, spec details and mutators
const buf = Buffer.from('\128\0\0\1', 'utf8');

// player details
const buf = Buffer.from('\128\0\0\2', 'utf8');

// B and c combined
const buf = Buffer.from('\128\0\0\1', 'utf8');

console.log(buf);

send buffer to server port + 1

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--  r   g    b
1B 00 00 00 = black
1B FF 00 00 = red
1B 00 FF 00 = green
1B 00 00 FF = blue

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//byte 1 is the game id, for UT2004 is hex 0x80 or binary 128
//byte 2 and 3 are always 0
//byte 4 is the one you change for different responses, either 0, 1, 2, or 3.

        const packets = [
            [128, 0, 0, 0], //server info 1 packet
            [128, 0, 0, 1], //detailed info 1 packet
            [128, 0, 0, 2], //player info 1 - 2 packets
            [128, 0, 0, 3] //packet 2 and 3 | 2 - 3 packets
        ];

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parseServerInfo(data, ip, port){

        data = JSON.stringify(data);
        data = JSON.parse(data).data;


        const serverInfo = {
            "ip": ip
        };

        if(port != undefined){
            serverInfo.port = port - 1;
        }
        

        //remove first byte(game id 0x80 / 128)
        data.splice(0,1);

        //remove response code (always 0 for server info)
        data.splice(0, 1);

        //remove server id (never used) always 4 bytes long
        data.splice(0, 4);

        //remove server ip (never used) always 4 bytes long
        data.splice(0, 4);

        //get game query port, always 4 bytes last 2 being 0, and first two being back to front

        const portHex = data[1].toString(16) + data[0].toString(16);

        serverInfo.port =  parseInt(portHex, 16);

        //remove server port bytes
        data.splice(0,4);

        //remove port for status query (never used) always 4 bytes
        data.splice(0,4);

        ...

    }