
If the system detects that the site you want to reach is known to be infected, you'll automatically be blocked from entry - keeping your data and computer safe. The system uses threat intelligence from more than a dozen of the industry's leading cyber security companies to give a real-time perspective on what websites are safe and what sites are known to include malware or other threats. Quad9 routes your DNS queries through a secure network of servers around the globe. Quad9 Internet Security & Privacy In a Few Easy Steps While I cannot seem to find a definitive list or map of locations quite yet, it does appear they have geared-up to serve the globe pretty well, with over 70 POPs already.

Telemetry data on blocked domains from Quad9 will be shared with threat intelligence partners for the improvement of their threat intelligence responses for their customers and Quad9. Over the next 18 months, Quad9 points of presence are expected to double, further improving the speed, performance, privacy and security for users globally. Quad9 has points of presence in over 70 locations across 40 countries at launch. New Quad9 DNS Privacy and Security Service Designed to Protect Users from Millions of Malicious Websites

"How DNS Works" published at "Quad9 DNS" on Nov 15, 2017.
