I want server ot be in masterlist but nonone to be able to join. What database I need to create or how. I don't want them to reach Login menu just Connection closed. How do I do that
At first open google and start learning JS/C# whatever language your mode is based on.
From this exact point you will be able to create this kind of system on your own in like 10 minutes.
Create a database table with only 1 entry - social club or ip or whatever else you want that will be a condition to connect to your server.
Fill that table with needed rows, at player connection (OnPlayerConnected event) check if his data match your condition and if not - kick him.