Quad9 is a free, non-profit public DNS service designed to enhance online security and privacy. When you type a web address into your browser, Quad9 converts that name into an IP address while actively filtering out known malicious sites.
Key Features
- Automated Threat Blocking: Quad9 aggregates threat intelligence feeds from dozens of cybersecurity firms. If a domain is flagged for malware, phishing, or botnets, Quad9 blocks the resolution and prevents your device from connecting.
- Strict Privacy Focus: Based in Switzerland (under strict privacy laws), Quad9 does not log or store IP addresses or personal identifiable information (PII).
- Encrypted DNS Support: Fully supports modern protocols including DoH (DNS over HTTPS), DoT (DNS over TLS), and DoQ (DNS over QUIC) to encrypt your DNS queries against eavesdropping.
Server Addresses & Configurations
| Feature / Service | Primary IPv4 | Secondary IPv4 | Primary IPv6 |
|---|---|---|---|
| Secured (Threat Blocking + DNSSEC) | 9.9.9.9 | 149.112.112.112 | 2620:fe::fe |
| Unsecured (No Blocking) | 9.9.9.10 | 149.112.112.10 | 2620:fe::10 |
| ECS Enabled (Location-based routing) | 9.9.9.11 | 149.112.112.11 | 2620:fe::11 |
Note: The default and most popular configuration is 9.9.9.9 (Secured).
Comparison with Competitors
Feature Quad9 (9.9.9.9) Cloudflare (1.1.1.1) Google (8.8.8.8) Primary Focus Threat Protection & Privacy Pure Speed & Privacy Speed & Reliability Malware Blocking Built-in (Default) Optional (1.1.1.2) No Data Privacy Non-profit, Swiss jurisdiction Commercial, Privacy-focused Commercial, Aggregated logs
