Free Domain Names - .com, .net, .org .info are the domain name extension that follows the name that you have selected. It can indicate the kind of organization that is hosting the site. .com/commercial, .net/network, .org/nonprofit. These are the most common top level extensions used by individuals and businesses today. More and more people are buying all three to protect their name from others taking advantage of their hard work. Anyone can register a domain name in any of the three extensions if they are available.