Who Is 9.9.9.9 DNS?

9.9.9.9 is the address for Quad9, a free public DNS resolver operated by the Quad9 Foundation, a nonprofit organization based in Switzerland. Quad9 was founded through a partnership involving IBM, Packet Clearing House, and the Global Cyber Alliance, with a mission centered on internet security rather than advertising or data collection. Its main feature is real-time threat blocking: every domain a device tries to reach is checked against continuously updated threat intelligence feeds, and known malicious domains linked to malware, phishing, or botnets are blocked automatically before a connection is made. Quad9 states it does not sell user data or log personally identifiable information. It's a good option for users who want an added layer of protection built directly into their DNS resolution, without installing any extra software.