Domain-specific language from the national character set, letters, numbers and "-" (that is, the hyphen or minus sign) any combination, but both can not contain the beginning and end "-." Domain name in letters not case sensitive. Domain Name up to 67 bytes (including the suffix. com,. net,. org, etc.), for example: your-name.com domain name that is a qualified, but the domain name www.your-name.com your-name. com under the name of the host called www.