Domain name service (DNS) server and DNS client
DNS is one of the most important services that is present on the internet. An internet has thousands of devices that are a part of it and each of these devices is referred to as a host. Each host could be a printer, router, computer, or any other device. Each host has a unique IP address associated with it. Apart from the IP address, each host also has a unique hostname associated with it. For example, if the hostname is LP471
and it is present in a domain technest.com
, then the fully qualified domain name (FQDN) of the host is LP471.technest.com
. The FQDN is used to identify the host uniquely within the DNS namespace. The DNS namespace contains some commonly used name suffixes; they are as follows:
.com
: Commercial organizations.edu
: Educational institutions.gov
: Government organizations.org
: Non-profit bodies like IEEE.net
: Networking organizations
Apart from these commonly used name suffixes, there are several others, too.