What is Quad9 used for?

Quad9 is a free DNS recursive service that blocks lookups of malicious host names to protect against malware, phishing, spyware, and botnets. It is a good fit for replacing default ISP or enterprise DNS for improved security and protecting IoT systems from malicious domains.

Is Quad9 open source?

No. Quad9 is proprietary (closed-source) software. In the Security category, open-source options include Cryptomator, VeraCrypt and Onetime Secret.

What are some alternatives to Quad9?

Quad9 competes with Cisco Umbrella.

Quad9: features, pricing and alternatives

About Quad9

Quad9 is a free DNS recursive service that replaces a default ISP or enterprise DNS configuration. It blocks lookups of malicious host names from an up-to-the-minute list of threats, protecting computers, mobile devices, and IoT systems against malware, phishing, spyware, and botnets.

The service is operated by the Swiss-based Quad9 Foundation. No data containing the user's IP address is ever logged, connections can employ encryption, and the platform is designed to be GDPR-compliant.

Key features

Blocks lookups of malicious host names from an up-to-the-minute threat list
Protects against malware, phishing, spyware, and botnets
No logging of IP address data
Encrypted connections supported
GDPR-compliant design
Operated by the Swiss-based Quad9 Foundation

Good fit for

Replacing default ISP or enterprise DNS for improved security
Protecting IoT systems from malicious domains

Tags: dns; security; privacy; threat-blocking; recursive-resolver

Quad9: questions and answers

What is Quad9 used for?: Quad9 is a free DNS recursive service that blocks lookups of malicious host names to protect against malware, phishing, spyware, and botnets. It is a good fit for replacing default ISP or enterprise DNS for improved security and protecting IoT systems from malicious domains.
Is Quad9 open source?: No. Quad9 is proprietary (closed-source) software. In the Security category, open-source options include Cryptomator, VeraCrypt and Onetime Secret.
What are some alternatives to Quad9?: Quad9 competes with Cisco Umbrella.