Domain Name Server(DNS) Configurator
An IP network works with numbers. Each machine has a unique
4 parts number. It is easier to work with names than with numbers.
Further, it is easier to work with name if they are organized in
groups, and potentially those groups subdivided in sub-groups.
A group is called a domain. A machine acting as a translator
from names to IP numbers is called a DNS. It is a server which
either knows how to translate a machine name to its IP number
or knows how to ask other DNSs if it can't do it itself.