Используйте приложение APKPure
Историческую версию Fast Domain Search можно получить на Android
Он будет искать ваши термины в других расширениях домена.
Fast Domain Search is the simple and customizable domain search application. You can search your terms in the other domain extensions to show which one is available or unavailable to register. You can also see the details by clicking searched items.
All the search requests sending from your device to the WHOIS servers directly. It means there is no third party APIs or services using for this.