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
ns1.bluehost.com	74.220.195.31	491,451
ns2.bluehost.com	69.89.16.4	491,438
f1g1ns1.dnspod.net	119.167.195.3	432,802
f1g1ns2.dnspod.net	112.90.143.29	432,123
ns1.dreamhost.com	66.33.206.206	394,923
ns2.dreamhost.com	208.97.182.10	394,908
ns3.dreamhost.com	66.33.216.216	394,504
dns2.name-services.com	98.124.197.1	347,989
dns1.name-services.com	98.124.192.1	347,969
dns3.name-services.com	98.124.193.1	347,959
dns4.name-services.com	98.124.194.1	347,647
dns5.name-services.com	98.124.196.1	346,344
dns.technorail.com	62.149.128.2	333,923
dns2.technorail.com	62.149.132.2	333,922
dns3.arubadns.net	95.110.220.5	333,196
dns4.arubadns.cz	81.2.199.73	333,194
ns1.dns.ne.jp	210.188.224.9	286,385
ns2.dns.ne.jp	210.224.172.13	286,332
ns66.1und1.de	217.160.83.171	240,472
ns65.1und1.de	217.160.82.171	240,471

Survey Limitations

Our survey, while having an impressive 99,709,116 sites and 38,740,277 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).