How to create a list of recently expired domains?

Question

I see many websites offering services to list recently expired domains. I also see many blogs on how to use these websites.

However, none of them explain what is necessary to generate the list in a computerized manner. Is it possible to do this without saving all the domain names and querying the whois to see if the registration is gone?

Answer 1

Well, you wouldnt check every domain against whois every day. Instead, you would keep track of the expiration date of each domain from whois, and only check the domains that have expired to see if they have been renewed or not.