question Bulk Domain Name Checker Script

[Hanish Arora]

Does anyone here have a script or know a method to check domain name availability of thousands of domains or even a million domains in one go ? I am not looking for a website that allows me to check 500 or thousands domains availability status in one go but a method that can be implemented in a way that it'll check a million domain availability or even more daily and that too without using any API. Anyone with any clue..or tip..will be helpful.

thnx