Is it possible to detect that the same premium player is joining my server from two clients? Lets say Premium minecraft player A joined a premium (onlin=true) server. The next minute, the same premium minecraft player tries to join the same server from another client. Will the connection automatically be blocked by client? or will the server knows that the player is trying to join it again from another client? (since we can obtain IP from players) Do i simply do offlineplayer1.isOnline() && offlineplayer1.getPlayer() == player2 && !offlineplayer1.getPlayer().getAddress().equals(player2.getAddress()) to check?