Quad9
A free DNS recursive service that blocks malicious host names and protects user privacy.
Network SecurityIntrusion Detection and Prevention SystemsCloudStartup · SMB · Mid-Market · EnterpriseFree
A free DNS recursive service that blocks malicious host names and protects user privacy.
Checked October 2026.
Quad9 is a free DNS recursive service that blocks lookups of malicious host names from an up-to-minute list of threats, protecting against malware, phishing, spyware, and botnets, while guaranteeing privacy. The service is operated by the Swiss-based Quad9 Foundation, with a mission to provide a safer and more robust Internet for everyone.
Quad9 protects user privacy by not logging IP addresses, employing encryption, and being GDPR-compliant. The service is dedicated to keeping personal data under the control of the end user.
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No integrations are listed for this product yet. Check the vendor's documentation, or ask the vendor which integrations and APIs it supports.
Common questions about Quad9: features, pricing and alternatives.
Quad9 is a product in the Intrusion Detection and Prevention Systems category. It covers DNS Security.
Quad9 is free. Download and setup instructions are at https://www.quad9.net/.
Alternatives to Quad9 listed on CybersecTools:
Compare all Quad9 alternatives at https://cybersectools.com/alternatives/quad9
Quad9 is available as a cloud service. It is listed for startups, small businesses, mid-market companies and enterprises. It is free.
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