Quad9 a free DNS security solution that uses to protect users against most common cyber threats and their privacy.
It keeps blocking you against known malicious domains and prevents your computer and IoT devices from connecting to malware or phishing sites.
Quad9 created in collaboration with IBM Security, Packet Clearing House and the Global Cyber Alliance (GCA), intend to provide users an added privacy and security protection as they across the internet.
It checks the website with IBM X-Force threat intelligence database which consists of 40 Million analyzed web pages and images. Also, it feeds on 18 additional threat intelligence sources.
All of these sources combined into threat mitigation feed gives a vast database to Quad9, which makes it to act rapidly in case of risks emerge.
How Does it work
To use Quad9 DNS service change your computer preferred DNS server to 22.214.171.124, then your request will be routed through Quad9 DNS instead of your ISP default DNS.
It has an inbuilt threat intelligence if it detects malware or other infection in the domains you enter it blocks from accessing it.
Quad9 says IP addresses of end users are not stored to disk or distributed outside of the equipment answering the query in the local data center. Quad9 is a nonprofit organization dedicated only to the operation of DNS services. There are no other secondary revenue streams for personally-identifiable data, and the core charter of the organization is to provide secure, fast, private DNS.
Servers distributed worldwide and they are placed primary at Internet exchange points, so it reduces the time and distance better than any other solutions.
At launch severs they placed servers at 70 locations, more than 160 locations scheduled on 2018 and the systems are anycast which automatically routes to the closest operational system.