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OCaml implementation of the DNS protocol
OCaml Other

Build Status

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.

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 a Lwt-based client resolver, preferably both recursive and iterative. Patches for this are highly welcome!
  • EDNS0 extensions.
  • DNSSEC extensions (using Cryptokit).
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