.COM, .NET

.com and .net are the most popular and widespread generic Top Level Domains in the world. The extension .com (commercial) is the extension with the highest number of domain name registrations, whereas .net (networking) was initially designed for organisations and/or entities in the worldwide network (such as for instance ISP’s). However, .net gradually became an alternative for .com
The current Registry for .com and .net is Verisign Inc.

.ORG

The Registry Operation was assigned to PIR (Public Interest Registry) in 2003, with the intention to bring the nature of the domain name registrations back in line with the original purpose of this Top Level Domain : creating a domain space designed for non-profit organisations. For the time being the domain name registration policy is similar to the one for .com, and the annual domain name registration fee is identical.

.INFO

.info is one of the new unrestricted, generic Top Level Domains which were launched in 2001 : anyone can register .info domain names. Afilias, the official Registry, adopts an annual domain name registration fee which is similar to the one for .com, .net and .org
The annual domain name registration fee which applies to APIsrs.com Resellers remains identical to the one for .com .net and .org

.BIZ

.biz too is a recent newcomer in the Internet domain name business. The exclusive Operator of the Registry is Neulevel, a joint venture between two companies. The .biz TLD was designed to promote business on the Internet. The annual domain name registration fee which applies to APIsrs.com Resellers remains identical to the one for .com .net and .org

.US

.us is the official country code Top Level of the United States. This TLD is particularly interesting for individuals or businesses having affinity or a relation with the US.