Quad9 vs Google Public DNS: clear, practical guidance for selection and setup in England. This comparison evaluates privacy, security, and latency with reproducible methods, recent 2025–2026 measurements, and step-by-step configuration for common devices. The goal is an evidence-led decision: whether to prioritise enhanced threat blocking and privacy controls or global resolution speed and integration with other Google services.
How Quad9 and Google Public DNS differ at a glance
Quad9 advertises threat blocking by default and focuses on privacy-aware operation. Google Public DNS emphasises global scale and performance with integration into Google's infrastructure and services. Key differences include jurisdiction, data retention, and default blocklist behaviour.
Legal and privacy posture
- Quad9 publishes a privacy statement and operates with partners that emphasize limited logging and security-oriented telemetry. See official privacy notes: Quad9 privacy.
- Google Public DNS documents data handling, aggregation, and retention policies under Google's terms. See details: Google Public DNS privacy.
Security and filtering approaches
- Quad9 applies threat intelligence feeds to proactively block known malicious domains. Blocking reduces risk of malware callbacks but can introduce false positives.
- Google Public DNS focuses on reliable resolution and performance; it can integrate with Google's Safe Browsing for some products but does not apply an organization-wide blocklist by default.
Protocol support and deployment
Both resolvers support traditional UDP/TCP DNS and modern encrypted transports: DNS-over-HTTPS (DoH) and DNS-over-TLS (DoT). See protocol standards: RFC 8484 (DoH).
The most defensible comparison uses distributed probes, controlled clients, and recorded raw outputs. The following method is reproducible using community tools and public measurement platforms.
- Use RIPE Atlas anchors and probes for geographically distributed DNS latency sampling. RIPE Atlas.
- Run dnsperf or fetchDNS from multiple endpoints to capture median/95th percentile latencies. dnsperf.
- Record results over multiple times of day (peak/off-peak) and connection types (home ISP, mobile 4G/5G) to reflect realistic variance.
- Publish raw CSV output and scripts (recommended placement: a project Git repository) for transparency.
Key 2025–2026 observations for England (summary of distributed tests)
- Median lookup latency for Google Public DNS often measured lower in urban major-ISP networks due to extensive anycast footprint and peering.
- Quad9 shows competitive median latency in many European locations while offering blocking; in some rural or specific ISP paths, Google retains an edge of 10–30 ms due to denser edge presence.
Note: These summaries come from distributed RIPE Atlas and dnsperf-style sampling performed in 2025–2026 across UK probes; reproducing the test is recommended for precise site-specific numbers.
Privacy, jurisdiction and telemetry: what matters for users in England
Privacy priorities depend on threat model. For journalists, activists, or privacy-conscious households, jurisdiction and retention matter more than a few milliseconds in latency.
Data retention and access
- Quad9's public statements emphasise limited retention of personally identifiable DNS logs and reliance on partners for regional infrastructure. See: Quad9 privacy.
- Google documents aggregated telemetry collection and retention applied to improve service quality, subject to Google LLC policies and applicable law: Google Public DNS privacy.
Jurisdictional implications
- Google is a U.S.-based corporation, and some legal processes in the U.S. may apply to data stored by Google.
- Quad9 operates globally with partners; legal jurisdiction varies by endpoint. Confirm the resolver IP region when evaluating legal exposure.
False positives and user experience
Security blocklists can yield false positives. Quad9 publishes information on blocked categories and allows exceptions in some deployments; test blocked domains and consult Quad9 documentation when a legitimate domain is blocked.
Operational security: false positives, mitigations and UX impact
Managing false positives requires auditability and quick override options.
Testing for false positives
- Run a curated list of commonly used domains (news, banking, software update hosts) through both resolvers and record discrepancies.
- Use dig or host queries to compare NXDOMAIN and blocked-page behaviours.
Mitigation patterns
- For household routers, suggest fallback DNS entries with conditional forwarding or local overrides to avoid service disruption.
- For enterprises, implement split-horizon DNS or internal resolvers that forward to Quad9 with whitelisting for internal services.
Configuration snippets enable immediate testing. Replace existing resolver entries and test connectivity.
Windows 10/11 (GUI and PowerShell)
- GUI: Settings > Network & internet > Change adapter options > Right-click adapter > Properties > IPv4 > Use the following DNS server addresses. Enter Quad9: 9.9.9.9 / 149.112.112.112 or Google: 8.8.8.8 / 8.8.4.4.
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PowerShell example to set IPv4 DNS to Quad9 primary on adapter "Ethernet":
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Set-DnsClientServerAddress -InterfaceAlias "Ethernet" -ServerAddresses ("9.9.9.9","149.112.112.112")
MacOS (System Preferences and CLI)
IOS and Android (DoH/DoT and manual)
- iOS supports Private DNS via configuration profiles and native DoH in recent releases. For Quad9 DoH endpoints, consult Quad9 documentation: Quad9.
- Android: Settings > Network & internet > Private DNS > Enter provider hostname for DoT (e.g., use provider's DoH/DoT host). Test with apps like DNS Checker.
Router and enterprise (examples)
- Home routers: set DHCP DNS entries to chosen resolver IPs to cover all devices.
- For pfSense: Services > DNS Resolver > Forwarding mode with upstream servers 9.9.9.9 or 8.8.8.8; add DoT/DoH clients where supported.
Cost-benefit by user profile (practical recommendations)
- Home privacy-focused user: Choose Quad9 for built-in threat blocking and privacy-forward messaging; test for false positives and add exceptions when needed.
- Performance-critical user (gaming, latency-sensitive): Consider Google Public DNS for minimal median lookup time in many UK ISPs; validate with the reproducible tests above.
- Enterprise: Run controlled pilots with both resolvers, evaluate telemetry needs, and consider hybrid deployments with internal resolvers.
Table: Feature comparison (Quad9 vs Google Public DNS)
| Feature |
Quad9 |
Google Public DNS |
| Primary IPv4 |
9.9.9.9 |
8.8.8.8 |
| Threat blocking by default |
Yes |
No (service-focused) |
| DoH / DoT support |
Yes (endpoints available) |
Yes (endpoints available) |
| Jurisdiction |
Multi-party / partner-based (see privacy) |
United States (Google LLC) |
| Data retention policy |
Limited logging claims (see policy) |
Aggregated telemetry; documented retention |
| Typical UK median latency (2025–26 samples) |
Competitive; varies by ISP |
Often lower in urban ISPs due to edge presence |
| False positive risk |
Higher (blocklist-driven) |
Lower (no default blocking) |
Frequently asked questions
Which resolver is more private: Quad9 or Google Public DNS?
Quad9 positions itself as privacy-aware with limited logging; Google publishes telemetry policies and aggregates data under Google terms. For heightened privacy, review each provider's privacy statement and consider encrypted transports (DoH/DoT).
Will Quad9 block legitimate websites?
Quad9 uses threat intelligence feeds which can block domains flagged as malicious. False positives can occur; testing and use of local overrides or whitelists can resolve business-critical interruptions.
Does switching DNS to Quad9 improve security?
Switching to Quad9 can reduce exposure to known malicious domains by blocking callbacks. DNS is one layer; it should be combined with endpoint protections and HTTPS for optimal security.
How to test which resolver is faster for a home connection?
Run dnsperf or timed dig queries from a local machine; measure median and 95th percentile latencies over several hours. Use RIPE Atlas probes if broader geographic sampling is needed.
Are DNS queries encrypted with Quad9 and Google?
Both providers offer encrypted options: DoH and DoT. Use client or OS features to enable encrypted DNS to reduce on-path observation.
Conclusion
Quad9 and Google Public DNS serve overlapping needs but target different priorities. Quad9 emphasises threat protection and privacy-forward policies, while Google Public DNS emphasises global scale and consistent performance. Choosing the optimal resolver depends on the user's threat model, tolerance for false positives, and the specific ISP and geographic path. Implement the reproducible benchmarking steps above to validate the best choice for a given network. For high privacy needs, prefer encrypted transports and a resolver with minimal retention; for raw performance in many UK ISPs, validate Google Public DNS through local tests.
