Knot DNS is a high-performance authoritative-only DNS server which supports all key features of the modern domain name system.

Open source Knot DNS is open-­source. It is com­plete­ly free to down­load and use. The source code is avail­able un­der GPL 3+ li­cense. Our de­vel­op­ment process is trans­par­ent and driv­en by the needs of com­mu­ni­ty and do­nat­ing user­s. The tar­get plat­forms are Lin­ux, BS­D's, ma­cOS, and oth­er POSIX op­er­at­ing sys­tem­s.

Feature-packed Knot DNS pro­vides es­sen­tial DNS fea­tures in­clud­ing in­cre­men­tal zone trans­fers (IXFR), dy­nam­ic up­dates (DDNS) and re­sponse rate lim­it­ing (RRL). More ad­vanced fea­tures in­clude au­to­mat­ic DNSSEC sign­ing, dy­nam­ic A/AAAA/PTR records syn­the­sis, or rapid on-the-fly re­con­fig­u­ra­tion.

High performance The serv­er is suit­able for any use case. With its high per­for­ma­ce, un­matched DNSSEC im­ple­men­ta­tion, and oth­er fea­tures it works ex­cep­tion­al­ly well as a root or a TLD name serv­er. It's ca­pa­ble of non-stop op­er­a­tion. The re­spond­ing code is com­plete­ly lock­-free and there­fore the serv­er achieves very high re­sponse rate.