Quad9, operated by the Quad9 Foundation, is a free, public DNS (Domain Name System) recursive resolver that provides a crucial layer of security, privacy, and performance for internet users. It automatically blocks access to known malicious websites, including malware, phishing, and spyware domains, before your computer can even connect to them. The primary workflow involves changing your device's or router's DNS settings to Quad9's IP addresses (9.9.9.9 and 149.112.112.112), after which all your internet lookups are routed through their secure servers. It works universally across any device or network that allows custom DNS configuration, including Windows, macOS, Linux, iOS, Android, and home routers. Its most used feature is its proactive blocking of malicious domains, powered by threat intelligence from over 18 different security vendors. Quad9 is a non-profit organization that does not log your IP address or use your DNS data for advertising, ensuring a high standard of user privacy.
Why It’s Useful
Quad9 eliminates the risk of accidentally visiting malicious websites and falling victim to malware or phishing attacks, acting as a critical first line of defense against online threats. For the average home user, it provides 'set-it-and-forget-it' security that proactively protects every device on their network without requiring any software installation. For the small business owner, it offers an enterprise-grade security feature to protect employees from inadvertently accessing dangerous sites, enhancing overall network security at no cost. Quad9 is entirely free to use, supported by donations and partnerships, making its robust security features genuinely accessible to anyone. Compared to default ISP DNS servers or even Cloudflare DNS, Quad9 uniquely focuses on integrating multiple, diverse threat intelligence feeds to block a wider array of malicious domains more effectively. A power feature for advanced users is its DNSSEC validation, which helps ensure the authenticity and integrity of DNS responses, protecting against DNS spoofing attacks. A non-technical person can configure their home router to use Quad9's DNS in under 5 minutes, protecting all connected devices immediately.
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