Quad9 is a nonprofit public DNS resolver focused on security and privacy. Its recommended service blocks malicious domains, validates DNSSEC, and avoids EDNS Client Subnet by default.
Why it is included:
- Strong daily-driver pick for privacy plus malware protection
- Explicit privacy policy: Quad9 says it does not collect or record IP addresses and does not correlate IPs with DNS query data
- No account or dashboard required
- Good default for routers, operating systems, and browsers that support custom DNS
Recommended setup:
Tradeoffs:
- Malware blocking can occasionally create false positives
- It is not customizable like dashboard-based filtering resolvers
- Encrypted DNS protects the DNS lookup in transit, but it does not make traffic anonymous
Verdict:
Use Quad9 when you want a simple, trustworthy default resolver with strong privacy posture and useful security blocking.
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