A domain name can be up to 63 characters long excluding the dot and 2 to
4 characters used to identify the top-level domain .BIZ, .COM, .INFO, .NET,
.ORG, or .US
Valid characters in a domain name include letter, numbers and hyphens
"-". The domain name must start with and end with a letter or
"http://" and "www." are not part of a domain name.
Instead they are used with your domain name to form a URL (Universal
Resource Locator) that can be used by web browsers to find your site on
the World Wide Web.