FQDN Definition Stands for "Fully Qualified Domain Name." An FQDN is a domain name that includes a hostname. For example, the URL "www.techterms.com" is an FQDN since it contains a hostname ("www") and a domain ("techterms.com"). The domain name "techterms.com" is not fully qualified because it does not include a hostname. An FQDN can be broken down into three parts: Hostname: mail, ftp, store, support, etc. Domain: apple, microsoft, ibm, facebook, etc. Top level domain (TLD):...