DNS servers work by matching the domain names you type into apps—like web browsers—to their associated IP address. When you type a domain name into your browser, for example, your PC contacts the DNS servers it has listed, the server looks up the IP address for that domain name, and then the PC can fire off it’s browsing request to that IP address. The trouble is that most ISPs maintain DNS servers that can be a little on the slow and unreliable side. Google maintains their own, free, public DNS server that is typically much faster and more reliable. You just have to tell your computer to use it.
Note: The techniques in this article work in Windows 7, 8, and 10.
Right-click the network status icon in your system tray, and then click “Open the Network and Sharing Center” on the context menu.
In the “Network and Sharing Center” window, click the “Change adapter settings” link at the upper left.
In the “Network Connections” window, right-click the connection for which you want to change the DNS settings, and then click “Properties” on the context menu.
In the properties window, select “Internet Protocol Version 4 (TCP / IPv4)” on the list, and then click the “Properties” button.
The bottom half of the “Internet Protocol Version 4 (TCP / IPv4) Properties” window shows the DNS settings. Select the “Use the following DNS server addresses” option. Next, type in the IP addresses for the preferred and alternate DNS servers you want to use. Here is the IP addresses for Google DNS.
When you’ve typed in the addresses, click the “OK” button.
Fore more information directly from Google on their Public DNS please click here.