What is Domain Name Server (DNS) and How it Works? | Tech Blog

Imagine, You don't have any phone book and you will have to keep everyone's mobile number in your brain. Every time a person calls you from a number, you can't write it anywhere. The only option available is to Remember. Of course, most of you would feel irritated. This is the natural tendency of Humans that we can't remember numbers easily. So we use phone book of our smartphone to save contact numbers.

The same applies to the Internet. Every smartphone, computer, laptop or any other device connected to the Internet has its own IP Address. An IP Adress or Internet Protocol Address is a 32-bit numeric logical address assigned to every device on the Internet. Even the websites have its own IP Address. Whenever you type google.com in the address bar of your browser, your browser doesn't even know what this google.com is. To open any website over the Internet it must have to resolve into its IP address and here the concept of Domain Name server or Domain Name System comes in. Let's see What is Domain Name Server and How it works?

Also Read: How Much RAM Do Our Smartphone Really Need?

Domain Name Servers are the internet equivalent of a phone book which contains all the public domains and its corresponding IP Addresses. DNS is an internet service that translates the domain name into IP addresses. When ever you request for google.com or any other website, your request first goes to DNS servers. Then, DNS server finds the corresponding IP Address associated with that domain and send your request to the website server or hosting and finally the website loads into your browser.

But many times even after so many attempts, your website doesn't open or it took too much time to open. This is because there are a huge number of websites on the Internet which updates or changes daily. This is quite a tedious task to maintain and update all these records in the DNS server. Sometimes, the DNS doesn't know the IP address of the website you want to open. In this case, the first level DNS which is generally maintained by Internet Service Providers (ISPs) and Wireless carriers ask for IP address from Root level DNS which again asks from Top Level Domain Servers (TLDs). But to keep this article simple, I am not going too much into details.

There are several public DNS services available which you can use in case your websites are not resolving in one go and you are not happy with the default DNS of your ISP. Google also provides public DNS – 8.8.8.8 and 8.8.4.4.

How to change DNS Address?

• First Press Win+R and type ncpa.cpl, this will open Network connection window.
• Double click on the network whose DNS addresses you want to change.
• Then go to Properties.
• Lastly, open Internet Protocol version 4 (TCP/IPv4) and change Preferred DNS server and Alternate DNS server to 8.8.8.8 and 8.8.4.4 respectively.

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