Short for "network", .net is one of the six original "generic" Top Level Domains (TLDs). It is currently the Internet's second largest TLD, with over 40 million registrations worldwide as of 2010. The .net domain was originally intended as a TLD directed toward Internet Service Providers and other infrastructure companies. Since then, registration of .net domains has become open and unrestricted however still primarily used as a designation of a network based organisation. Registration of .net domain names has also shifted toward a common alternative to the .com TLD in recent years.