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DNS Site Operator
September 1st, 2021

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.

Search
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
exodus.

    

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
jm1.dns.com  119.167.180.140  510,040
jm2.dns.com  183.253.57.200  510,040
ns1.bluehost.com  162.159.24.80  252,777
ns2.bluehost.com  162.159.25.175  252,762
dns2.technorail.com  95.110.136.8  232,372
dns.technorail.com  94.177.210.13  232,371
dns4.arubadns.cz  81.2.216.125  232,223
dns3.arubadns.net  95.110.220.5  232,222
ns1.dreamhost.com  162.159.26.14  202,364
ns2.dreamhost.com  162.159.26.81  202,363
ns3.dreamhost.com  162.159.27.84  202,341
ns5.kasserver.com  85.13.128.3  194,848
ns6.kasserver.com  85.13.159.101  194,834
ns02.one.com  195.206.121.138  193,097
ns01.one.com  195.206.121.10  193,097
ns1.gname.net  128.14.28.52  190,480
ns2.gname.net  128.14.28.53  190,480
ns1.dns.ne.jp  61.211.236.1  173,333
ns2.dns.ne.jp  133.167.21.1  173,320
dns1.registrar-servers.com  156.154.132.200  134,177

Survey Limitations
Our survey, while having an impressive 73,804,644 sites and 22,016,028 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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