Quad9

About Quad9

Quad9 is a nonprofit, Swiss-based public DNS resolver that blocks access to malicious domains to improve security, privacy, and performance for users worldwide. It operates a global network of resolver clusters and threat intelligence partnerships to protect computers, mobile devices, and IoT from malware, phishing, spyware, and botnets. The service emphasizes GDPR-compliant data handling and does not log IP addresses, aiming to keep user data under end-user control. Quad9 is hosted in Switzerland and backed by several founding partners and sponsors, delivering free DNS protection to individuals and organizations globally.