Quad9 provides public DNS servers that work with IPv4 and IPv6 addresses. In addition to a primary DNS server that enables domain blocklist and DNSSEC validation, Quad9 also offers an unsecured DNS server address that can be used to know if the Quad9 threat feed has flagged a legit domain as insecure. Quad9 supports the DNSCrypt protocol, which, as the name says, encrypts the connection between the client device and the DNS server to prevent MITM attacks. The public DNS service claims that it doesn’t store any personal data of the users. To accomplish this security aspect, Quad9 feeds its systems with updated data from various providers and public sources.
Quad9 is meant to block malicious websites to prevent phishing attacks, etc. The free DNS service was co-developed by the Global Cyber Alliance, IBM, and Packet Clearing House. The name of this public DNS server resembles its IP address, i.e., 9.9.9.9. Oh, and as a side note, you shouldn’t confuse it with increasing internet speed.
Google Public DNS can give the much-needed latency boost that your ISP struggles with, thereby improving the website loading speed.
It also works with the next-gen IPv6 protocol, which is the successor to the IPv4.
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