An open DNS recursive service for free security and high privacy

Quad9 is a free, Swiss-based DNS recursive resolver that blocks lookups of malicious hostnames using a constantly updated threat list, protecting devices from malware, phishing, spyware, and botnets while improving performance. It operates over 230 resolver clusters in more than 110 countries, has blocked over 670 million queries daily, and logs no IP-identifying data, remaining GDPR-compliant and privacy-focused.