The Fully Qualified Domain Name is comprehensive domain identification for a computer or host on a computer network or the internet. The FQDN is made of the hostname and domain name. The two are separated by a period (.), and no space is allowed between them. In addition, characters for use in the FQDN range from 0 to 9 and ‘a’ to ‘z’. In www.myname.xyz.com for example, ‘www’ denotes the host, while ‘myname’ is the hostname, and ‘xyz.com.’ is the domain name. The three make a FQDN. By entering the FQDN when accessing a website, the user is able to access the DNS server faster. A user trying to connect to the remote host, which is not the local internet provider, can use FQDN.
Earlier, FQDN ended with a period (.) Nowadays, however, it is common to see web addresses that ignore the period. When this are submitted into a DNS resolver, the resolver inserts the period. The period qualifies the domain name as a DNS root zone therefore clearing any ambiguities that may confuse it with another domain. A rule that applies across the times however is the requirement that all characters making up the FQDN be limited to 255 characters. Additionally, only numbers, alphabetical letters and the hyphen are allowed for use in FQDN formulation. Each quota of the FQDN can have 63 characters only.
The trailing dots in the FQDN are responsible for the specification of the domain name’s location, which is established through a hierarchy order that connects the root domain to the top-level domain. The FQDN is what most internet user type in the information bar through which they are able to access log in after the DNS server resolves the name submitted, connects it to the IP address and gives the user a login prompt.
Without using the FQDN, and maybe using the hostname alone, connecting to the host server may not be possible in some cases because the computer applications used may fail to resolve the connection between the hostname and the related IP address. The FQDN is especially important when one is connecting to a remote host not supported by the same ISP the user gets internet services from. Overall, FQDN makes web surfing easier, less time consuming and fun. It is also a good way of avoiding searches using the search engines which can only give unspecific results hence forcing the user to pick what is relevant from the search results.