Quad9
Quad9 is a nonprofit organization supported by IBM, Packet Clearing House, Global Cyber Alliance, and many other cybersecurity organizations for the purpose of operating a privacy-and-security-centric public DNS resolver. Its main differentiator from other open DNS resolvers is that it automatically blocks domains known to be associated with malicious activity, and does not log the IP address of its users that sent queries to it.
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, DNS over HTTPS over port 443, and DNSCrypt over port 443.| Secure | |
| DoH address | https://dns.quad9.net/dns-query |
| IPv4 addresses | 9.9.9.9 149.112.112.112 |
| IPv6 addresses | 2620:fe::fe 2620:fe::9 |
Quad9 DNS service is accessible via the IP addresses for IPv4: and, and IPv6: and. This service supports blocklist, DNS encryption, and DNSSEC.
An unsecured service that supports limited security features is accessible on IPv4: and, and IPv6: and. This service only supports DNS encryption.
A secured service supporting ECS is accessible on IPv4: and, and IPv6: and. This service supports blocklist, DNS encryption, DNSSEC, and ECS.