Google Public DNS uses rate limiting and some heuristics to reduce the likelihood of being used in a DNS amplification attack [1]. I presume OpenDNS does somet

Google Public DNS uses rate limiting and some heuristics to reduce the likelihood of being used in a DNS amplification attack [1]. I presume OpenDNS does something similar. Even if public DNS resolvers didn't exist, you could still run your own private recursive name server (either on your computer or on your home router) and avoid your ISP's. That's what I do. [1] https://developers.google.com/speed/public-dns/docs/security#rate_limit https://developers.google.com/speed/public-dns/docs/security...