Quad9 DNS

Quad9 is a global, free, non-profit recursive DNS resolver service dedicated to enhancing the privacy and cybersecurity of internet users. Operated by the Quad9 Foundation, based in Zürich, Switzerland, the organization was founded in 2016 by IBM, Packet Clearing House, and the Global Cyber Alliance. Quad9 offers a secure DNS platform that blocks malware, phishing sites, and botnets while ensuring user privacy by not logging IP addresses. The service is accessible through various protocols, including DNS over TLS and DNS over HTTPS, and operates from over 114 global locations for high-speed performance. Quad9 provides two types of resolvers: a secure resolver with active threat filtering and an unsecured resolver for users who prefer minimal interference. It is widely used by consumers, educational institutions, ISPs, local governments, and small to medium enterprises, all benefiting from its commitment to security and privacy without commercial interests.