What is DNS ? How it Works?

If you have ever used the Internet, its sure that you’ve used the Domain Name System, or DNS, even without realising it. When you connect to facebook.com and see facebook.com in your browser’s address bar right? ,but in reality, you are not connected to Facebook real website!  To understand it, you’ll need to know bit about DNS.

What do you mean by DNS?

The Domain Name System (DNS) underpins the web we use every day. It works transparently in the background, converting human- readable websites names into computer- readable numerical IP addresses. DNS translates Internet domain and host names IP addresses and vice versa. DNS does this by looking up that information on a system of linked DNS servers across the Internet. However, different DNS servers can behave differently in terms of speed and security.

For example, Google’s domain name is google.com. If you want to visit Google, you just need to enter google.com. However, your computer doesn’t understand where “google.com”. Behind the scenes, the internet and other networks use numerical IP addresses. One of the IP addresses used by Google.com is If you type this into your web browser’s addresses bar, you’d also end up at Google’s website.


How Domain Name System Work?

Whether you’re accessing a Web site or sending email, your computer uses a DNS server to look up the domain name you’re trying to access. The proper term for this process is DNS name resolution, and you would say that the DNS server resolves the domain name to the IP address as explained above.

DNS clients send requests to and receive responses from DNS servers. Requests containing name, that result in an IP addresses like,  being returned from the server. Requests containing an IP address and resulting in a name hence, Google. DNS implements a distributed database to store this name and last- known address information for all public hosts on the Internet.


Without DNS servers, the Internet would shut down very quickly. But how does your computer know DNS server to use? Typically, when you connect to your home network. Internet Service Provider (ISP) or Wi-Fi network, the modem or router that assigns your computer’s network address also sends some important network configuration information to your computer or mobile device. That configuration includes one or more DNS servers that the device should use when translating DNS names to IP address

These are some important DNS basics. Thanks for reading!!


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