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You are viewing an outdated report. The latest version of this report was published on February 1st, 2020

DNS Site Operator
December 1st, 2006

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
dns4.name-services.com  179,911
dns5.name-services.com  179,795
dns2.name-services.com  179,726
dns1.name-services.com  179,700
dns3.name-services.com  179,678
yns1.yahoo.com  112,341
yns2.yahoo.com  112,339
ns8.san.yahoo.com  108,736
ns9.san.yahoo.com  108,735
dns.technorail.com  100,285
dns2.technorail.com  100,282
ns1.ipowerweb.net  83,266
ns1.dreamhost.com  82,923
ns2.dreamhost.com  82,909
ns3.dreamhost.com  82,218
ns.xinnetdns.com  81,040
ns.xinnet.cn  80,961
ns2.ipowerweb.net  80,496
wsc1.jomax.net  79,960
wsc2.jomax.net  79,948

Survey Limitations
Our survey, while having an impressive 24,414,182 sites and 14,216,772 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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