Question by Perry Nickles: Are there sites that provide domain lists based on registrant search?
I want to be able to search by domain registrant to find a list of all domains owned by that registrant. Any services that currently provide this?

Best answer:

Answer by livewyre
Not as a free service, but if you visit:
http://whois.domaintools.com
and type in a name of a domain that you know someone owns – it will tell you how many other domains are registered to the same person, you then have to cough up at least $ 80 to get a list of domains, the more domains they have the more it costs.
However this only looks at the name – a common name will throw out thousands of results.
I also found a list of ‘whois’ type applications – I don’t know if any of them can do what you are asking, but they may be worth looking at:
http://www.filebuzz.com/findsoftware/Find_Domain_By_Owner/1.html

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