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You are viewing an outdated report.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

DNS Site Operator
October 1st, 2010

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
dns1.name-services.com  397,669
dns2.name-services.com  397,668
dns3.name-services.com  397,615
dns4.name-services.com  397,378
dns5.name-services.com  395,833
ns1.dreamhost.com  293,902
ns2.dreamhost.com  293,841
ns3.dreamhost.com  293,755
dns2.technorail.com  230,173
dns.technorail.com  230,173
ns1.bluehost.com  220,351
ns2.bluehost.com  220,340
ns.xinnet.cn  211,811
ns.xinnetdns.com  211,760
ns51.domaincontrol.com  166,877
ns52.domaincontrol.com  165,810
ns1.dns.ne.jp  164,391
ns2.dns.ne.jp  164,285
ns57.1and1.com  161,617
ns58.1and1.com  161,615

Survey Limitations
Our survey, while having an impressive 55,313,541 sites and 26,167,149 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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