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You are viewing an outdated report.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, 2018

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
ns1.bluehost.com  374,069
ns2.bluehost.com  374,057
dns2.technorail.com  298,290
dns.technorail.com  298,288
dns4.arubadns.cz  298,216
dns3.arubadns.net  298,216
ns1.dreamhost.com  291,309
ns2.dreamhost.com  291,304
ns3.dreamhost.com  291,151
f1g1ns2.dnspod.net  253,295
f1g1ns1.dnspod.net  253,246
ns02.one.com  247,769
ns01.one.com  247,769
ns1.dns.ne.jp  224,343
ns2.dns.ne.jp  224,330
ns5.kasserver.com  221,690
ns6.kasserver.com  221,666
ns.namespace4you.de  218,836
ns2.namespace4you.de  218,833
ns2.hans.hosteurope.de  161,280

Survey Limitations
Our survey, while having an impressive 67,767,137 sites and 29,723,863 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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