A domain name is said to be fully-qualified when it includes the names of every DNS domain from the local domain on up to ".", the DNS root domain. Conceptually, the fully-qualified domain name indicates the path to the root, as does the absolute path name of a UNIX file. However, fully-qualified domain names are read from lowest, on the left, to highest, on the right. Therefore, a fully-qualified domain name has the syntax:
The fully qualified domain names for the ajax domain and its subdomains are:
ajax.com. sales.ajax.com test.ajax.com. manf.ajax.com
Note the dot at the furthest right position of the name.