Is it possible to allow intranet panel only on specific domain?

Hello everyone. To use DB with domains, that I want to be public i setup *.dev.example.com for my projects. All redirect to DB instance. However, if someone types random apsodka.dev.example.com then he can access my login/password area.

Is it possible to hide it from there? Like make it acessible from secret-db-panel.dev.example.com ?