Implementation of a name server of the DNS type

In the early days of computing, access methods were based on direct links from terminals to central "mainframe" servers. In those days, there was no need to address dozens of machines, as the architecture was centralized. Then the first TCP/IP-based networks appeared, and the number of machines with which we could communicate increased. Finally, the advent of the Internet, the network of networks, multiplied this problem, as the exchange of information between millions of machines became possible.

By default, a machine can be identified by its IP address (in the format a.b.c.d). Given the sheer number of machines, it proved impossible for anyone to remember the IP addresses of all the machines with which they might need to exchange information. The introduction of a naming service (DNS: Domain Name Service) removed this obstacle.