Top level domains aren't installed in one specific location. These domains are at the top of the hierarchy of the internet. These appear at the end of website links in the form or "org" and "com". These are commonly installed in each country around the world, in government buildings and Universities.
top-level domains
top-level domains
verisign Inc, owns root nameserver for the .com, .net, and .name generic top-level domains and the .cc and .tv country-code top-level domains. http://www.verisign.com
List of Internet top-level domains: http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
ICANN, or the Internet Corporation for Assigned Names and Numbers is the group that assigns top level domains. It is a private corporation overseen by several regulatory agencies.
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Internet Corporation for Assigned Names and Numbers (ICANN)
Internet Corporation for Assigned Names and Numbers (ICANN)
There are a total of about 280 different TLDs (Top Level Domains), the best known of which are ".com", ".net", and ".org".Most countries have their own country code Top Level Domains, such as ".ca" for Canada, ".jp" for Japan, ".mx" for Mexico, and so on.
This is the top level domain for Papua New Guinea.
DNS is a Domain Name Server, used to create unique entries in an Active Directory. The brand Neustar seems to be associated with Ultra DNS. Ultra DNS is the name for one of the top DNS providers and services many Top Level Domains and Second Level Domains.
For a fairly comprehensive list of TLDs (Top Level Domains), including the couple hundred or so that are country code TLDs see:http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains