This is a pure OCaml implementation of the DNS protocol. It is intended to be a reasonably high-performance implementation, but clarity is preferred rather than low-level performance hacks.

Build Status

To build it, please use the OPAM package manager (1.2+):

opam pin add dns .

This will install the dependencies needed and give you a working development version of the library.


  • lib/ contains the core DNS protocol, which is packed into the Dns module.
  • lib_test/ contains unit tests and sample uses of the library. In particular, time_server is a simple dynamic responder.

Areas that need work:

  • We need an Lwt-based client iterative resolver Patches for this are highly welcome!
  • EDNS0 extensions
  • DNSSEC extensions (using nocrypto)
  • TC bit and TCP fallback
  • mDNS resolver


org:mirage org:xapi-project

Published: 10 Nov 2017

Dependencies (5)

  1. cmdliner
  2. base-unix
  3. dns-lwt < "2.0.0"
  4. jbuilder >= "1.0+beta9"
  5. ocaml >= "4.03.0"

Reverse Dependencies