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You are viewing an outdated report.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

DNS Site Operator
March 1st, 2019

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  358,055
ns2.bluehost.com  358,045
dns2.technorail.com  297,277
dns.technorail.com  297,276
dns3.arubadns.net  296,883
dns4.arubadns.cz  296,883
ns1.dreamhost.com  282,823
ns2.dreamhost.com  282,818
ns3.dreamhost.com  282,737
ns02.one.com  245,825
ns01.one.com  245,825
ns1.dns.ne.jp  226,555
ns2.dns.ne.jp  226,543
f1g1ns2.dnspod.net  223,682
f1g1ns1.dnspod.net  223,486
ns5.kasserver.com  223,436
ns6.kasserver.com  223,423
ns.namespace4you.de  207,276
ns2.namespace4you.de  207,274
ns2.hans.hosteurope.de  156,274

Survey Limitations
Our survey, while having an impressive 64,215,220 sites and 28,979,540 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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