There are organizations that are called registries that manage each TLD option. When you register domain names, you would first visit a domain registrar who would in turn check with the registry that manages that TLD to see if the domain is available. If the domain for the TLD you want discovers that it is in fact available, the registry adds it to their registry and gives you access to it. If the domain has already been registered by another user for that TLD, you will be shown during the domain registration process that the domain isn't available.
For more than a decade, Jeffrey L. Wilson has penned gadget- and video game-related nerd-copy for a variety of publications, including 1UP, 2D-X, The Cask, Laptop, LifeStyler, Parenting, Sync, Wise Bread, and WWE. He now brings his knowledge and skillset to PCMag as Senior Analyst. When he isn't staring at a monitor (or two) and churning out web... See Full Bio
Some domain names are only available at auction. For now, we’ve chosen to feature buy it now domain names because they are often available immediately. We are working to improve our search engine to make it easier for advanced users to choose whether they want to include domains at auction (or domains with hyphens and numbers) in the search results.