Domain NamesInternet domains form the basis of the common Internet naming scheme. For example, www.cnn.com is a domain name, and cnn.com is a domain.
Domains are structured in the form of an inverted tree. Each branch or leaf on the tree is labeled with an simple alphanumeric string, and a complete domain name is written by stringing all the labels together, separated by periods. Thus, www.cnn.com is a third-level domain name. The root domain is com, the second level label is cnn, and the third level is www. Incidentally, there is no standard way to visually distinguish a branch from a leaf. In fact, the Internet domain system makes no distinction between the two, since branches can have any attributes of a leaf, and leaves can have children added to them and become branches.The diagram below illustrates the novell.com domain. The interpretation of domain names ending in novell.com is solely at the discretion of Novell. They manage the shaded area of the domain name space.
Generic Domains Country Domains (partial list) com - Commercial uk - United Kingdom edu - Educational fr - France org - Non-profit Organizations de - Germany net - Networking Providers nl - Netherlands mil - US Military us - United States gov - US Government au - Australia int - International Organizations ax - AntarcticaTo make use of domain names, they must be converted into 32-bit IP Addresses. This is done using the DNS Protocol.