The HIERARCHY OF DOMAIN NAMES

Starting with the top of the the hierarchy, which sits at the end of the domain name, you see the top-level domain of net. There are a small number of top-level domains on the Internet, and they fall into two categories-topical and geographic. Topical top-level domains identify the type of organization that runs the computer in question, and are used mostly in the United States. Geographic top-level domains identify the country where that computer lives, and used primarily outside of the United States. The first table shoes the main topical top-level domains(more may be coming soon, since .com in is filling up) and the second table gives some examples of common geographical top-level domains. Every country has its own top-level domain country code.

Top-level Domain	Organization Type
.com .edu .gov .mil .net .org	Commercial Educational US Government US military Network (ISPs) Non-profit organization

Top-level Domain	Country
.au .br .ca .de .fr .jp .uk .us	Australia Brazil Canada Germany France Japan United Kingdom United States