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You are viewing an outdated report.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
November 1st, 2009

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  347,095
dns2.name-services.com  347,090
dns3.name-services.com  347,023
dns4.name-services.com  346,758
dns5.name-services.com  345,449
ns1.dreamhost.com  245,755
ns2.dreamhost.com  245,688
ns3.dreamhost.com  245,619
dns2.technorail.com  202,045
dns.technorail.com  202,044
ns51.domaincontrol.com  164,078
ns52.domaincontrol.com  163,387
ns1.bluehost.com  155,391
ns2.bluehost.com  155,380
ns.xinnetdns.com  137,948
ns.xinnet.cn  137,888
ns58.1and1.com  129,529
ns57.1and1.com  129,527
ns2.xinnet.cn  124,203
ns2.xinnetdns.com  124,165

Survey Limitations
Our survey, while having an impressive 49,302,149 sites and 22,718,213 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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