What makes up a valid domain name?

The only valid characters for a domain name are letters, numbers and a hyphen "-". Hyphens may be anywhere in the middle of a name, but can not be located at the end or beginning of a name. A valid domain name does not have spaces. A domain name can be up to 67 characters long -- including the 4 characters used to identify the Top Level Domain (.com, net, .org). Do not type the www. or your ext. before your domain name when registering as it is automatically inserted.