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Domain Names Your domain name is the address of your web site, for example www.YourCompany.com. Domain names consist of a series of alphanumeric labels separated by periods. The domain name is an address of a computer network connection and that identifies the owner of the address. The labels must follow the rules for ARPANET host names. They must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphens. There are also some restrictions on the length. Domain names must be 63 characters or less. Continue reading in the Domain Name Registration Information section for tips on choosing a name, visit the Web Resources section for links to registrars, and shop for books in the Print Resources section.