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You are viewing an outdated report.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
August 1st, 2003

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
dns01.exodus.net  4,544
dns02.exodus.net  4,491
dns03.exodus.net  4,448
dns04.exodus.net  4,389
sca02.sec.dns.exodus.net  734
sca03.auth.dns.exodus.net  424
sca04.auth.dns.exodus.net  422
sca03.sec.dns.exodus.net  125
exodus.hipdesign.com  100
ns3.exodus.net  23
exodus.ssmnet.net  23
ns2.nj.exodus.net  22
pdns01.lndn01.exodus.net  20
wlhm02sdns01.exodus.net  17
exodus.micro-net.net  16
exodus.eccentrichosting.net  16
exodus2.theworldat.com  15
exodus.theworldat.com  15
exodus.icorp.net  15
sntc04sdns01.exodus.net  15

Survey Limitations
Our survey, while having an impressive 11,899,618 sites and 7,198,149 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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