Thread

They solve different problems and are not interchangeable resolvers. Quad9 is a public resolver with malware filtering. It does NOT protect from surveillance, telemetry, or advertising networks. NextDNS is a cloud DNS firewall with full threat intelligence. Protects from advertising, tracking SDKs, fingerprinting, telemetry, CDNs, cross service profiling, and malware. They are built for different threat models. Use whatever meets your needs.