Month: January 2022

Domain Name System – explained in a simple wayDomain Name System – explained in a simple way

The Domain Name System, or DNS, is one of the Internet’s pillars that we utilize every day but don’t realize it. This system is like a telephone directory with the names of people. But instead of a phone, it uses an IP address corresponding to a domain name. 

A brief history of DNS

The Domain Name System was created in 1980 by Paul Mockapetris. Until then, to access a website, you had to enter its IP. Since this process is prolonged and we can’t remember every single IP address, Paul invented the DNS system. To this day, it is the backbone of the internet. 

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Testing Reverse DNS with Dig commandTesting Reverse DNS with Dig command

Testing if you have properly set a Reverse DNS zone and PTR records inside it is a straightforward task with the built-in tool Dig command. You can see if the IP address matches the domain name with a simple DNS lookup. So let’s get into it.

​What do we need?

  • Linux computer, or a Mac with Homebrew and Dig command installed.
  • The built-in tool that is called Dig command.
  • The IP address that you want to check.

​What is the Dig command?

The Dig command is a built-in command that you can find on any Linux distribution and serves for various DNS lookups, including a Reverse DNS lookup.

How does the Dig command work?

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