Knot Resolver
Knot Resolver is a caching DNS resolver that can scale from large resolver farms to routers in home networks.
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A modern resolver for demanding environments
Knot Resolver is a modern resolver implementation designed with scalability, resilience, and flexibility in mind. Its design differs from other resolvers: the core architecture is compact and efficient, and most advanced features are implemented as optional modules, which reduces the attack surface and improves performance.
Easy scalability
from individual installations
to large resolver farms
Modular Architecture
small core with expandable
features through modules
Open source
GPL license
DNSSEC validation
verified and secure DNS responses
Two recursive DNS resolvers running simultaneously for stability and risk mitigation.
Main advantages
Open source
Knot Resolver is open source and free to download and use. The source code is available under the GPL license.
Extensive features
Many of the solver's features are available immediately after installation as modules, while the core remains compact and efficient.
Top-notch performance
The server uses a different scaling strategy than other DNS recursors—a threadless, non-shared architecture.
Safe and stable
The code is constantly checked using an extensive set of tests to ensure stability and prevent performance drops.
PROJECT WEBSITE
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Advanced support
Professional support (SLA, NDA)
for both routine and demanding operationsCommunity support
quick help from the community and the team
Frequently asked questions
References
Partners around the world trust us
Milan Sýkora
Network Services Specialist, CETIN
Ólafur Guðmundsson
Engineering director, Cloudflare
Robert Šefr
CTO, Whalebone
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Kateřina Chmelová
Director of Sales