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You are viewing an outdated report. The latest version of this report was published on February 1st, 2020

DNS Site Operator
January 1st, 2020

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
jm2.dns.com  698,999
jm1.dns.com  698,999
ns1.bluehost.com  359,691
ns2.bluehost.com  359,684
dns2.technorail.com  313,533
dns.technorail.com  313,532
dns4.arubadns.cz  313,191
dns3.arubadns.net  313,190
ns1.dreamhost.com  283,430
ns2.dreamhost.com  283,426
ns3.dreamhost.com  283,325
ns2.ecpage.com  271,744
ns1.ecpage.com  271,744
ns1.myhostadmin.net  267,843
ns2.myhostadmin.net  267,832
ns4.myhostadmin.net  267,798
ns3.myhostadmin.net  267,798
ns5.myhostadmin.net  267,795
ns6.myhostadmin.net  267,794
ns01.one.com  259,259

Survey Limitations
Our survey, while having an impressive 69,009,466 sites and 31,474,581 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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