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You are viewing an outdated report. The latest version of this report was published on August 1st, 2019

DNS Site Operator
May 1st, 2004

This report details the names and locations of all DNS servers on the internet, as well as the number of domains that are serviced by these servers. In this fashion, we can discover

  • the number of sites hosted by ISPs
  • the number of sites hosted by hosting companies that use an ISP's facilities, but run their own name servers
  • the number of sites hosted by specialty DNS service providers
  • the organizations that choose to operate their own DNS servers rather than to use those of their ISP/hosting provider.

The survey works by determining each month the authoritative name server for each host (and more accurately, each domain) in our survey. We then count the number of domains hosted on each DNS server.

Curious about the size of a the domain set handled by a particular ISP's name servers? Try searching for the ISP's name server. For example, to find Exodus' name servers, try


Top 20 by Host Name
The top 20 name servers ranked according to the number of domains handled by each name server, with a name server uniquely identified by its fully qualifed name, are shown below.

Name Server Name   Name Server IP   Domains
ns.buydomains.com  116,106
this-domain-for-sale.com  116,100
dns2.name-services.com  104,797
dns1.name-services.com  104,796
dns3.name-services.com  104,781
dns4.name-services.com  104,737
dns5.name-services.com  104,288
ns1.directnic.com  60,103
ns0.directnic.com  59,962
ns9.san.yahoo.com  50,853
ns8.san.yahoo.com  50,853
a.ns.interland.net  49,856
b.ns.interland.net  49,832
ns1.ultsearch.com  49,403
ns2.ultsearch.com  49,398
c.ns.interland.net  49,326
yns1.yahoo.com  48,669
yns2.yahoo.com  48,668
ns.schlund.de  48,492
ns1.secure.net  44,620

Survey Limitations
Our survey, while having an impressive 15,438,961 sites and 8,765,987 domains in the data set, does not include all web sites and domains. We only include those that we consider active, which, by our definition, means we found the site via a link from somewhere else. Sites not linked by anyone are by definition not included in the survey.

We also actively drop sites out of the survey that fail to respond 3 consecutive months to our HTTP queries. So, while a DNS server might still respond with information for a domain, if there is no active web site that we can reach for the domain in question, then the domain is not included in this survey at all, even if it still has other functioning services (such as email).

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