A first level domain name is: www.firstlevel.com second level domain name is: www.second.firstlevel.com or: www.firstlevel.com/second
The three parts of a domain name are the host record (www, @(none) or *(other)), the SLD (second level domain) and the TLD (top level domain) or ccTLD (country code top level domain). For example wiki.answers.com:wiki = host nameanswers = SLD (second level domain).com = TLD (top level domain)
If you are referring to the ".com" or ".net" portion of the domain name, it is called the "top level domain name." Anything in between "www" and the top level domain name is called a secondary domain name.
After the "www", the next bit is called "domain name" e.g. in www.exampleweb.com "exampleweb" is the domain name. More specifically it is also called "second-level domain name", the first-level domain name being the "com" at the end.
I think you're referring to the top level domain. .cn is the top level domain for mainland China.
.com is an example of an top-level domain--Do you need a good .com domain name? Visit http://bit.ly/domainbr
On the Internet, "com" is one of the top-level domain names that can be used when choosing a domain name. It generally describes the entity owning the domain name as a commercial organization. Along with the second-level domain name (for example: "whatis" in whatis.com), the top-level domain name is required in Web and e-mail addresses.The top-level domain names administered by ICANN and its delegate agencies are: com, edu, gov, int, mil, net, and org. In addition to these, domain name applicants within the United States may also be able to register a name under a U.S. top-level domain name based on geography. See RFC 1480 - The US Domain and visit the U.S. Domain Registry for registration procedures.
co.in is an upper-level domain for businesses in India, and com.co.in is a domain name registrar for that domain.
This is called a "Top-level Domain".
com
Top-Level Domain Name
The master domain name is top level domain name. The Domain Master Browser is necessary on a routed TCP/IP network, that is, when a Windows domain spans more than one TCP/IP network.............