According to RegistrarStats.com, EstDomains is the 49th largest domain name registrar, with more than 270,000 domains. Security Fix is still working on cataloging all of those domains, but for the purposes of this analysis we'll examine some 10,000 Web site names that are both registered through EstDomains and using the company's various domain name servers to route traffic to them.
I chose to focus on that particular subset of 10,000 domains mainly so that EstDomains could not simply disavow knowledge of the sites' activities by claiming it serves as nothing more than a registrar for those domains.
Turns out, at least one-third of those domains (.CSV) are currently blacklisted by SURBL.org, which tracks Web site names that are advertised in junk e-mail.
Have a look at the complete list of those 10,000 names -- which I've made available at this link here (.CSV file) -- and it should quickly become evident why so many are blacklisted.
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Brian Krebs on Computer Security. The Washington Post Company.