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You are viewing an outdated report. The latest version of this report was published on November 1st, 2018

DNS Site Operator
November 1st, 2015

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
f1g1ns1.dnspod.net  533,007
f1g1ns2.dnspod.net  532,576
ns1.bluehost.com  504,826
ns2.bluehost.com  504,808
ns1.dreamhost.com  387,465
ns2.dreamhost.com  387,459
ns3.dreamhost.com  387,086
dns.technorail.com  346,936
dns2.technorail.com  346,935
dns3.arubadns.net  346,385
dns4.arubadns.cz  346,385
dns2.name-services.com  318,186
dns1.name-services.com  318,184
dns3.name-services.com  318,155
dns4.name-services.com  317,974
dns5.name-services.com  316,716
ns1.dns.ne.jp  303,917
ns2.dns.ne.jp  303,890
ns1.51dns.com  268,008
ns2.51dns.com  268,007

Survey Limitations
Our survey, while having an impressive 97,938,321 sites and 38,888,208 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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