That is a very interesting question and it would certainly be a very
useful tool for tracking "cybersquatters".
Initial searches on Google such as "domain name registrant search" and
"search domain by registrant" proved to be vague and returned
thousands of results.
From my own Internet-related knowledge, I know that providing your
personal details on certain "Whois" lookups has now been made optional
if you are not a business.
The document [ http://www.nominet.org.uk/news/whois.html ], by the
United Kingdom naming authority Nominet, explains this in a little
However, the Google search query "dns registrant search" gave me one
result which was a real breakthrough.
If you visit the following URL and scroll down to the ninth result,
you will find a very large document by the highly respected Verisign
One section of this (Part 3.4.2) contains the quote: "The service MUST
provide the capability of searching for registrants by name or a
reasonable name subset. The service MUST provide a mechanism to
distribute this search across all applicable domain registries and
This document appears to be a set of guidelines for a "work in
progress" internet domain name directory.
I was very curious about this, I am aware of a project by Google
called "Google Labs" [ http://labs.google.com ] in which you can test
new experiments by the research team.
Luckily Verisign do have a similar venture: [
http://www.verisignlabs.com ], where I found the link to a search
engine called the "LDAP Service": [ http://www.ldap.verisignlabs.com
If you click on the "Search for Organization" link on the left, you
will get a simple search box.
Typing several different company names into this gave fantastic
For example, I tried entering: Microsoft, Yahoo, NTL, BBC and many
other American and British companies; I could then view a large list
of domain names which the companies own.
There appears to be a way of using this technology on your own web
you can see many downloads which include Windows programs. You can
even tweak the technology to your own needs because they also include
the full source code in several formats.
Normally, I would end the answer here, but the service I found by
Verisign Labs is an experiment and therefore may not be available
So, in addition I also located an alternative "paid" service by the
huge Thomson [ http://www.thomson-thomson.com ] research group.
They operate something called "SAEGIS", which is basically an advanced
online database tool; the URL for the service you require is: [
However, you can only register for the service by visiting: [
Although expensive, it may be useful as a backup service to you.
The only other resource which I could find was by the British Nominet
entity which may be linked in some way to the Verisign document I
These have a document [
http://www.nominet.org.uk/ref/expanded-whois.html ] on their Web site
which explains the need for a registrant search and they are planning
to implement this service in December 2002 which is great news.
Related Google searches:
"domain name registrant search"
"search domain by registrant"
"domain name change in rules registrant details"
Thanks for the fantastic question!