Quad9 is a not-for-profit public-benefit organization supported by IBM, Packet Clearing House (PCH), Global Cyber Alliance (GCA), and many other cybersecurity organizations for the purpose of operating a privacy-and-security-centric public DNS resolver. Its main differentiators from other DNS resolvers are that it does not record the queries users send to it, and that it automatically blocks domains known to be associated with malicious activity. Quad9 offers DNS over TLS service over port 853, DNS over HTTPS over port 443 and DNSCrypt service over port 443.
Quad9 supports DNS over TLS on port 853 (the standard) using an auth name of dns.quad9.net.
Quad9 supports DNS over HTTPS on port 443 (the standard) using an URL of https://22.214.171.124/dns-query.
- DNS over TLS
- DNS over HTTPS
- Domain generation algorithm
- Open Root Server Network
- Public recursive name servers
- "Quad9 Founding Organizations". Quad9. Retrieved 2018-04-08.
- "FAQ: How does Quad9 protect me from malicious domains?". Quad9. Retrieved 2018-04-08.
- "New "Quad9" DNS service blocks malicious domains for everyone". Ars Technica. Retrieved 2018-04-08.
- "FAQ: Does Quad9 support DNS over TLS?". Quad9. Retrieved 2018-04-08.
- "Privacy: Using DNS-over-TLS with the Quad9 DNS Service". Medium. Retrieved 2018-04-08.
- "DoH with Quad9 DNS Servers". Quad9. Retrieved 2018-10-05.
- "DNSCrypt Now in Testing". Quad9. Retrieved 2018-10-22.
- "FAQ - DNS Need to Know Info". Quad9. Retrieved 2018-04-08.
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