Quad9

Quad9 is a public DNS resolver that blocks access to malware infected websites.[1][2] The service protects privacy by not logging the IP address of users who set their computers to send queries to it.[3][4]

CleanerDNS, Inc., a California non-profit corporation, operates Quad 9.[5] CleanerDNS is supported by IBM, Packet Clearing House (PCH), Global Cyber Alliance (GCA), other cyber-security organizations, and private donations.[6][7]

Service

IP addresses

Quad9 operates recursive name servers for public use at the following IP addresses. These addresses are mapped to the nearest operational server by anycast routing. Quad9 offers DNS over TLS over port 853,[8] DNS over HTTPS over port 443,[9] and DNSCrypt over port 443.[10]

Secure
DoH address[11] https://dns.quad9.net/dns-query
IPv4 addresses[11] 9.9.9.9
149.112.112.112
IPv6 addresses[11] 2620:fe::fe
2620:fe::fe:9

Quad9 DNS service is accessible via the IP addresses for IPv4: 9.9.9.9 and 149.112.112.112, and IPv6: 2620:fe::fe and 2620:fe::fe:9.[11] This service supports blocklist, DNS encryption, and DNSSEC.

An unsecured service that supports limited security features is accessible on IPv4: 9.9.9.10 and 149.112.112.10, and IPv6: 2620:fe::10 and 2620:fe::fe:10.[11] This service only supports DNS encryption.

A secured service supporting ECS is accessible on IPv4: 9.9.9.11 and 149.112.112.11, and IPv6: 2620:fe::11 and 2620:fe::fe:11.[11] This service supports blocklist, DNS encryption, DNSSEC, and ECS.

See also

References
  1. "Quad9 FAQ: How does Quad9 protect me from malicious domains?". Quad9. Retrieved 2018-04-08.
  2. "New "Quad9" DNS service blocks malicious domains for everyone". Ars Technica. Retrieved 2018-04-08.
  3. "Quad9 Privacy Policy". Quad9. Retrieved 2018-04-08.
  4. "A Deeper Dive Into Public DNS Resolver Quad9". Internet Society. Retrieved 2018-04-08.
  5. Your Privacy Is Paramount, Quad9
  6. "About Quad9 DNS". Quad9. Retrieved 2018-04-08.
  7. "Quad9". Global Cyber Alliance. Retrieved 2018-04-08.
  8. "Quad9 FAQ: Does Quad9 support DNS over TLS?". Quad9. Retrieved 2018-04-08.
  9. "Quad9 FAQ: Does Quad9 support DNS over HTTPS (DoH)?". Quad9. Retrieved 2018-10-05.
  10. "DNSCrypt Now in Testing". Quad9. Retrieved 2018-10-22.
  11. "DoH with Quad9 DNS Servers". Quad9. Retrieved 2018-10-05.
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