A Fully Qualified Domain Name (FQDN), sometimes also referred to as an absolute domain name, is a domain name that specifies its exact location in the tree hierarchy of the Domain Name System (DNS). It specifies all domain levels, including the top-level domain and the root zone. A fully qualified domain name is distinguished by its lack of ambiguity: it can only be interpreted in one way. The DNS root domain is unnamed, which is expressed by the empty label, resulting in an FQDN ending with the dot character.

From this screen, you can Add or Modify an FQDN.