Knot Resolver is a caching DNS resolver scalable from huge resolver farms down to home network routers. Knot Resolver is a modern resolver implementation designed for scalability, resiliency, and flexibility. Its design is different from other resolvers: The core architecture is tiny and efficient, and most of the rich features are implemented as optional modules, which limits attack surface and improves performance. WWW: https://www.knot-resolver.cz/