9.9.9.9
Quad9 is designed to work quietly in the background — but getting there takes a few minutes of configuration. This section has the addresses, guides, and tools to make that straightforward. Whether you’re configuring a single device or deploying across an entire network, the resources below cover every step: which service addresses to use, where Quad9 operates, how to check whether a domain is blocked, and where to go if something isn’t working. Quad9 offers several service profiles, each with a different IP address and feature set. The recommended configuration includes malware blocking and DNSSEC validation. Additional profiles are available for ECS-enabled deployments or expert configurations without filtering. All services support IPv4, IPv6, DNS over HTTPS, DNS over TLS, and DNSCrypt. Quad9 systems are distributed across 260+ locations in 115+ countries, located primarily at Internet Exchange Points — where the highest concentration of network interconnections occur. Anycast routing directs every query to the closest operational system automatically. See the live status map to check current availability worldwide. If you’re trying to reach a site that isn’t loading, or want to verify that a known malicious domain is being blocked, use this tool to check a hostname or domain against Quad9’s threat list. Enter any domain to see whether Quad9 is blocking it — and why. Step-by-step instructions for configuring Quad9 on the most commonly used devices and operating systems — routers, Windows, macOS, Android, iOS, and more. Set it up once at the router level and protection extends to every device on the network automatically. Check the FAQ for answers to common questions about security, privacy, reliability, and configuration. For anything not covered there, use the contact form to reach the Quad9 team directly. You can also verify whether your device is currently using Quad9 at on.quad9.net, and check live service status at uptime.quad9.net.
Everything you need to set up, verify, and
get the most out of Quad9.
In This Section
Service Addresses & Features
Quad9 Locations
Search Blocked Domains
Setup Guides
Get Support