Access to the full files of registered .com and .net domains is
available through the "Shared Registration System". You can read a
bit the SRS here:
In order to participate and get approved access to the SRS you do have
to be a recognized registrar. The steps for doing this through
Verisign are available here:
In the section that says "Get Started", click on the link to "Become a
Registrar". This will open up a series of pages and forms that you
need to establish the technical and financial qualifications for
becoming a registrar.
If you can successfully negotiate the process, you would then be
eligible for access to the SRS.
The database is also available through a regular Whois search, but of
course, there are limits imposed on how much data can be accessed
through a given search. However, there are some Whois sites that
offer more flexibility than others. My favorite is:
If you need any advice about using this site, just let me know, and
I'll be glad to assist you.
I trust this information fully answers your question.
However, please don't rate this answer until you have everything you
need. If you would like any additional information, just post a
Request for Clarification to let me know how I can assist you further,
and I'm at your service.
All the best,
search strategy -- answer based on my own knowledge, and a search of
the Verisign website.