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
a.share-dns.com	172.64.52.212	498,525
b.share-dns.net	172.64.52.239	498,525
jm1.dns.com	218.98.111.214	285,685
jm2.dns.com	183.253.57.200	285,685
dns.technorail.com	94.177.210.13	249,575
dns2.technorail.com	95.110.136.8	249,575
dns3.arubadns.net	95.110.220.5	249,271
dns4.arubadns.cz	81.2.216.125	249,270
ns5.kasserver.com	85.13.128.3	224,584
ns6.kasserver.com	85.13.159.101	224,579
ns1.bluehost.com	162.159.24.80	216,630
ns2.bluehost.com	162.159.25.175	216,616
ns1.siteground.net	75.2.77.104	206,074
ns2.siteground.net	99.83.229.113	206,074
ns02.one.com	185.10.11.10	197,073
ns01.one.com	195.206.121.10	197,065
ns1.dreamhost.com	162.159.26.14	192,197
ns2.dreamhost.com	162.159.26.81	192,193
ns3.dreamhost.com	162.159.27.84	192,163
ns1.dns.ne.jp	61.211.236.1	175,358

Survey Limitations

Our survey, while having an impressive 66,726,696 sites and 21,556,555 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).