Projects / Howl


Howl is a cross platform implementation of the Zeroconf zero configuration networking standard. It includes daemons and a client side SDK for registering, browsing, and resolving network services, and assigning link local IP addresses without a DHCP server. On Windows 2000/XP, it includes a sidebar in Internet Explorer that allows users to browse zeroconf-enabled Web and FTP servers.

Operating Systems

Recent releases

  •  20 May 2005 04:48

    Release Notes: This release updates to mDNSResponder core 58-8-1. It compiles out heap debugging when the NDEBUG macro is set during compilation. Errors encountered when parsing conf file are now logged. Various unsafe sprintf calls were fixed. This release also compiles cleanly using Cygwin. Support for compiling under OpenBSD was added. Errors in the docs were fixed.

    •  28 Jan 2005 23:53

      Release Notes: This release fixes a broken and a compilation error on FreeBSD.

      •  27 Jan 2005 22:51

        Release Notes: This release fixes a bug where the build directory was not the source directory, and fixes memory leaks on cleanup. Patches have been added to make porting to operating systems other than Linux easier for autoipd.

        •  27 Mar 2004 21:36

          Release Notes: The Windows mDNSResponder hang on shutdown was fixed. The multi-threading bug in channel sharing code was fixed. All of the sw_rendezvous_* APIs were changed to sw_discovery_*. mDNSResponder can optionally configure files on startup to declare services info. An option was added to run mDNSResponder in a separate thread from the calling application. autoipd must be run as root. nifd must be run as root. autoipd was refactored.

          •  18 Feb 2004 01:21

            Release Notes: This version fixes an incorrect parameter to CreateWindow in sw_salt_init under Windows, a timeout bug in sw_salt_step under Mac OS X, and the mDNSResponder -i switch that was not working with alias interfaces. It adds an RPM spec for RedHat Linux, support for pkgconfig, a -a option to mDNSResponder, and sw_rendezvous_socket() and sw_rendezvous_read_socket() APIs for better integration in foreign event loops. It specifies __stdcall convention in Howl APIs under Windows.


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