As we know recently Bittrex than binance closed their doors for new users, Also Cryptopia did the same thing. Cryptopia also not accepting new users from now.
After Bittrex, binance is most trusted exchange in cryptocurrency loads of people sign up everyday and thats can be the reason for closing the new registrations. But we found a way to sign up on binance even they closed it few days ago.
Just go to this link and sign up.