Quad9 is founded by IBM, PCH and Global Cyber Alliance to provide a free DNS service to you that can block malicious websites when you are surfing the internet.
You can set it up on your router or personal computer in a few steps. It is painless to set it up as the official site provides videos and text documentation to help you to set it up.
Make sure you put "9.9.9.9" on the toppest position of your DNS list in your router or personal computer.
I have tested it and find out that the surfing speed is very fast without lagging. Finally, be keep in mind that Quad9 cannot 100% protect you from being reached all the malicious websites. However, it adds one more secure layer on your existing security stack.
That's all! See you.
