Why You Should Not Use Public DNS Servers

A few weeks backs I published a tutorial on using Google’s public DNS to improve your website loading where we talked about its speed benefits over your ISPs regular DNS server

In this post we are going to discuss why you should not use these DNS servers over your ISPs DNS server

I am not denying what I said in my previous Google DNS post, Using these public DNS can improve your website loading and give you are faster internet experience

What I am saying is, Your download speed might get affected if you ditch your service provider and go with these public DNS servers

This is not enough, Let us see the simple reason behind it

You might know about Content Delivery Networks (CDN)

That’s not a big problem if you haven’t, let me explain it to you

In general life, you know that if two things are coming towards you from different distances then the one whose starting point was closer reaches you first

What a CDN does is, it brings the website closer to you so that it reaches to you in less time.

Like when you visit a site simply hosted on any server then the file you will receive will be taken from the server.

What if the server is really very far from your present location? The loading time of the website will dramatically increase

If you visit a website which is powered by any CDN then when you request any file the CDN first tracks your current location using your IP address and sends you the files from the nearest possible location so that the process takes as much less time as possible.

These content delivery networks have their data centers located throughout the world at different locations to always give you the best possible experience, the more data centers a CDN has the more better it is.

Sorry for deviating from the topic a bit, let us just again come back to public DNS

When you use your ISPs Domain Name System (DNS) then the CDN is available to track down your exact location and send you the files from the nearest data center.

But, when you use public DNS servers like Google Public DNS or OpenDNS then your original IP address is hidden behind the DNS provider’s IP, it gets masked

As a result the CDN is not able to track your exact location and you get the files from the data center which is nearer to the public DNS server’s location.

So what should you do?

Ok, I have told you the problem but it would be extreme cruelty if I didn’t help you with the decision

I would suggest that try out both and check the browsing and downloading speeds of your favorite DNS providers and go with the one which the best experience with your frequently visited websites.

If you found this post useful then, you know what to do
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