Basic rules of Domain names:
1. Domain can consists of Alphabets a through z, and the digits 0 through 9.
2. Hyphens are allowed, but hyphens can not be used as first character of a domain name.
3. Spaces are not allowed
4. Special symbols (such as !,$,&, _ and so on) are not permitted, length of 2, and the maximum length of 63 characters.
5. The entire name may be at most 253 characters long.
6. Domain names are not case-sensitive.(It may be upper, lower or mixing of both case letters)
