Switching from your ISP's default DNS resolver to a public one like Cloudflare's or Google's is a common recommendation — worth understanding the actual tradeoffs rather than switching on reputation alone.
What public resolvers typically offer
- Performance. Large public resolvers often have extensive caching infrastructure and low-latency global presence, sometimes outperforming a smaller ISP's resolver.
- Encryption support. Most major public resolvers support DNS over HTTPS or DNS over TLS, letting you encrypt the trip to them even if your ISP's default doesn't offer that option.
- Published privacy policies. Reputable public resolvers typically publish specifics about what they log and for how long — worth actually reading rather than assuming, since policies and their trustworthiness vary.
- Optional filtering. Some public resolvers (like ones marketed toward families) offer built-in content filtering as an opt-in feature.
What you're trading away
Using a public resolver means shifting DNS visibility from your ISP to that resolver operator instead — not eliminating visibility, just relocating who has it. Some ISP resolvers offer better performance for local content due to network proximity, which a distant public resolver can't always match. And logging claims from any provider — public or ISP — ultimately rely on trusting their stated policy.
How to actually choose
Read the specific resolver's published privacy policy rather than relying on general reputation, confirm it supports encrypted transport if that matters to you, and verify after switching (using a tool like NetRiskScan's DNS Leak Test) that your configuration is actually taking effect.
FAQ
Is a public resolver always faster than my ISP's?
Not necessarily — it depends on network proximity and your ISP's own infrastructure quality, which varies significantly by provider and region.