Resolve DNS names like it’s 2024

Open source

Knot Re­solver is open-­source. It is com­plete­ly free to down­load and use. The source code is avail­able un­der GPL li­cense. Our de­vel­op­ment process is trans­par­ent and driv­en by the needs of com­mu­ni­ty and do­nat­ing user­s.

Feature-packed

Bat­ter­ies in­cluded, but op­tional! Many re­solver fea­tures are avail­able out-of-the-box as mod­ules while keep­ing core tiny and ef­fi­cient. Mo­du­lar ar­chi­tec­ture pro­vides a state-ma­chine like API for ex­ten­sions, and the C and Lua mod­ules make it great to tap into the res­o­lu­tion process. A novel fil­ter­ing tech­niques are just cou­ple lines of code away. It's the OpenResty of DNS.

High performance

The serv­er adopts a dif­fer­ent scal­ing strat­e­gy than the rest of the DNS re­cur­sors - no thread­ing, shared-noth­ing ar­chi­tec­ture (ex­cept cache that may be shared). You can start, stop, or re­config­ure in­stances with­out downtime.

Secure and stable

The code is be­ing con­stant­ly checked by an ex­ten­sive test­ing suite to at­tain sta­bil­i­ty, as­sure in­ter­op­er­abil­i­ty with oth­er DNS im­ple­men­ta­tion­s, avoid per­for­mance re­gres­sion­s, and cir­cum­vent pos­si­ble se­cu­ri­ty-re­lat­ed prob­lem­s.