AuthorsAnil Madhavapeddy, Tim Deegan, Richard Mortier, Haris Rotsos, David Sheets, Thomas Gazagnaire, Luke Dunstan and David Scott
Issue Trackerhttps://github.com/mirage/ocaml-dns/issues
Tagsorg:mirage and org:xapi-project
&dns>= 1.0.0
jbuilder>= 1.0+beta9
lwt>= 3.0.0
mirage-profile>= 0.8.0
Availableocaml-version >= "4.03.0"
PublishedJul 23, 2017
Source [http] https://github.com/mirage/ocaml-dns/releases/download/v1.0.0/dns-1.0.0.tbz
StatisticsInstalled 81 times last month.

DNS client and server implementation in pure OCaml

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