Doing some competitive research, but my key competitor put their domains on several IPs. I did a reverse IP lookup, but there are a bunch of other domains along with them (using shared hosting, I suppose).
I do know that they use 3 variations of the same registrant name. Is there any tool or method by which to query whois databases for that information?
How can I perform a whois search by registrant name?
Even thought it appears that the registrant data goes out to all the whois servers, it seems that none of the Whois offerings give you the option of searching against that field. Maybe some of the original command-line tools let you do this?
Here is one service that lets you search for registrant ID within the *.us domains: http://www.whois.us/.
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