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You are viewing an outdated report.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
December 1st, 2017

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
f1g1ns2.dnspod.net  506,446
f1g1ns1.dnspod.net  505,929
ns1.bluehost.com  422,439
ns2.bluehost.com  422,427
ns1.dreamhost.com  324,961
ns2.dreamhost.com  324,960
ns3.dreamhost.com  324,793
dns2.technorail.com  316,896
dns.technorail.com  316,895
dns3.arubadns.net  316,754
dns4.arubadns.cz  316,754
ns01.one.com  271,955
ns02.one.com  271,954
ns2.dns.ne.jp  257,715
ns1.dns.ne.jp  257,695
ns.namespace4you.de  234,219
ns2.namespace4you.de  234,214
ns5.kasserver.com  225,681
ns6.kasserver.com  225,657
dns1.name-services.com  208,531

Survey Limitations
Our survey, while having an impressive 98,212,376 sites and 33,945,309 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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