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Pure Python Multicast DNS Service Discovery Library (Bonjour/Avahi compatible)

Project description


This is fork of pyzeroconf, Multicast DNS Service Discovery for Python, originally by Paul Scott-Murphy (, modified by William McBrine (

The original William McBrine’s fork note:

This fork is used in all of my TiVo-related projects: HME for Python
(and therefore HME/VLC), Network Remote, Remote Proxy, and pyTivo.
Before this, I was tracking the changes for in three
separate repos. I figured I should have an authoritative source.

Although I make changes based on my experience with TiVos, I expect that
they're generally applicable. This version also includes patches found
on the now-defunct (?) Launchpad repo of pyzeroconf, and elsewhere
around the net -- not always well-documented, sorry.

Compatible with:

  • Bonjour

  • Avahi

Compared to some other Zeroconf/Bonjour/Avahi Python packages, python-zeroconf:

  • isn’t tied to Bonjour or Avahi

  • doesn’t use D-Bus

  • doesn’t force you to use particular event loop or Twisted

  • is pip-installable

  • has PyPI distribution

Python compatibility

  • CPython 2.6, 2.7, 3.3+

  • PyPy 2.2+ (possibly 1.9-2.1 as well)

  • PyPy3 2.4+


This project’s versions follow the following pattern: MAJOR.MINOR.PATCH.

  • MAJOR version has been 0 so far

  • MINOR version is incremented on backward incompatible changes

  • PATCH version is incremented on backward compatible changes


There are some people using this package. I don’t actively use it and as such any help I can offer with regard to any issues is very limited.

How to get python-zeroconf?

The easiest way to install python-zeroconf is using pip:

pip install zeroconf

How do I use it?

Here’s an example:

from six.moves import input
from zeroconf import ServiceBrowser, Zeroconf

class MyListener(object):

    def remove_service(self, zeroconf, type, name):
        print("Service %s removed" % (name,))

    def add_service(self, zeroconf, type, name):
        info = zeroconf.get_service_info(type, name)
        print("Service %s added, service info: %s" % (name, info))

zeroconf = Zeroconf()
listener = MyListener()
browser = ServiceBrowser(zeroconf, "_http._tcp.local.", listener)
    input("Press enter to exit...\n\n")

If you don’t know the name of the service you need to browse for, try:

from zeroconf import ZeroconfServiceTypes

See examples directory for more.



  • Many improvements to address race conditions and exceptions during ZC() startup and shutdown, thanks to: morpav, veawor, justingiorgi, herczy, stephenrauch

  • Added more test coverage: strahlex, stephenrauch

  • Stephen Rauch contributed:

    • Speed up browser startup

    • Add ZeroconfServiceTypes() query class to discover all advertised service types

    • Add full validation for service names, types and subtypes

    • Fix for subtype browsing

    • Fix DNSHInfo support


  • Fixed OpenBSD compatibility, thanks to Alessio Sergi

  • Fixed race condition on ServiceBrowser startup, thanks to gbiddison

  • Fixed installation on some Python 3 systems, thanks to Per Sandström

  • Fixed “size change during iteration” bug on Python 3, thanks to gbiddison


  • Fixed support for Linux kernel versions < 3.9 (thanks to Giovanni Harting and Luckydonald, GitHub pull request #26)


  • Fixed DNSText repr on Python 3 (it’d crash when the text was longer than 10 bytes), thanks to Paulus Schoutsen for the patch, GitHub pull request #24


  • Fixed installation on Python 3.4.3+ (was failing because of enum34 dependency which fails to install on 3.4.3+, changed to depend on enum-compat instead; thanks to Michael Brennan for the original patch, GitHub pull request #22)


  • Fixed EADDRNOTAVAIL when attempting to use dummy network interfaces on Windows, thanks to daid


  • Added some Python dependencies so it’s not zero-dependencies anymore

  • Improved exception handling (it’ll be quieter now)

  • Messages are listened to and sent using all available network interfaces by default (configurable); thanks to Marcus Müller

  • Started using logging more freely

  • Fixed a bug with binary strings as property values being converted to False (; thanks to Dr. Seuss

  • Added new ServiceBrowser event handler interface (see the examples)

  • PyPy3 now officially supported

  • Fixed ServiceInfo repr on Python 3, thanks to Yordan Miladinov


  • Set up Python logging and started using it

  • Cleaned up code style (includes migrating from camel case to snake case)


  • Fixed handling closed socket (GitHub #4)


  • Forked by Jakub Stasiak

  • Made Python 3 compatible

  • Added setup script, made installable by pip and uploaded to PyPI

  • Set up Travis build

  • Reformatted the code and moved files around

  • Stopped catching BaseException in several places, that could hide errors

  • Marked threads as daemonic, they won’t keep application alive now


  • Fix for SOL_IP undefined on some systems - thanks Mike Erdely.

  • Cleaned up examples.

  • Lowercased module name.


  • Various minor changes; see git for details.

  • No longer compatible with Python 2.2. Only tested with 2.5-2.7.

  • Fork by William McBrine.


  • allow selection of binding interface

  • typo fix - Thanks A. M. Kuchlingi

  • removed all use of word ‘Rendezvous’ - this is an API change


  • correction to comments for addListener method

  • support for new record types seen from OS X - IPv6 address - hostinfo

  • ignore unknown DNS record types

  • fixes to name decoding

  • works alongside other processes using port 5353 (e.g. on Mac OS X)

  • tested against Mac OS X 10.3.2’s mDNSResponder

  • corrections to removal of list entries for service browser


  • Jonathon Paisley contributed these corrections:

    • always multicast replies, even when query is unicast

    • correct a pointer encoding problem

    • can now write records in any order

    • traceback shown on failure

    • better TXT record parsing

    • server is now separate from name

    • can cancel a service browser

  • modified some unit tests to accommodate these changes


  • remove all records on service unregistration

  • fix DOS security problem with readName


  • changed licensing to LGPL


  • faster shutdown on engine

  • pointer encoding of outgoing names

  • ServiceBrowser now works

  • new unit tests


  • small improvements with unit tests

  • added defined exception types

  • new style objects

  • fixed hostname/interface problem

  • fixed socket timeout problem

  • fixed add_service_listener() typo bug

  • using select() for socket reads

  • tested on Debian unstable with Python 2.2.2


  • ensure case insensitivty on domain names

  • support for unicast DNS queries


  • added some unit tests

  • added __ne__ adjuncts where required

  • ensure names end in ‘.local.’

  • timeout on receiving socket for clean shutdown


LGPL, see COPYING file for details.

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