Blog

Quad9 provides security insights on the threats blocked by us between July and December 2025. This time we analyzed the top 25 domains blocked by us. The report combines DNS telemetry data and open-source intelligence with statistics and analysis to provide security insights on the top malicious domains visited by our users and blocked by Quad9 DNS.

Quad9 General Manager, Simon Forster, writes to express serious concern regarding emerging proposals that would require DNS resolvers to intervene in content enforcement actions.

Around the world, courts are increasingly allowing holders of intellectual property (IP) rights to shift the cost and burden of enforcement onto neutral third parties — including the organisations that keep the internet running.

Quad9 will be discontinuing support within DNS-over-HTTPS (DOH) using HTTP/1.1 on December 15, 2025.

As policymakers increasingly look to legislate and control the Internet, we’ve noted (and support) recent publications and efforts from our friends and partners urging policymakers to think twice before looking to disrupt the basic infrastructure which underpins the Internet.

To protect our users, Quad9 blocks DNS lookups of malicious host names from an up-to-the-minute list of threats. This blocking action protects your computer, mobile device, or IoT systems against a wide range of threats such as malware, phishing, spyware, and botnets, and it can improve performance and privacy. This blogpost provides security insights on the threats blocked by Quad9 DNS between January and June 2025.

At Quad9, we aim to show appreciation for the dedication of our staff and their contributions to the growth and health of the organization by showcasing quarterly staff highlights. This quarter, we are featuring Senior Operations Engineer, Michał “rysiek” Woźniak.

To protect our users, Quad9 blocks DNS lookups of malicious host names from an up-to-the-minute list of threats. This blocking action protects your computer, mobile device, or IoT systems against a wide range of threats, such as malware, phishing, spyware, and botnets, and it can improve performance and privacy. In this blogpost, we want to cover crypto-related threats that we protect our users from.

WaveX, a leading ICT infrastructure provider in Africa, has joined forces with global DNS security leader Quad9 to bolster Internet resilience, speed, and safety across Kenya. As the official infrastructure sponsor for Quad9 in the region, WaveX is now hosting DNS nodes in Nairobi and Mombasa, bringing critical cybersecurity infrastructure closer to home.

Quad9 is pleased to announce that our 9.9.9.11 (ECS) service is now validating domains which sign with the Ed25519 algorithm.