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

Project description


This is a fork of pyzeroconf, Multicast DNS Service Discovery for Python, originally by Paul Scott-Murphy (, modified by William McBrine (, and then further modified (off the 0.19.1 tag, the last to support Py2.7) by Jamie Alexandre (

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

Python compatibility

  • CPython 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-py2compat?

The easiest way to install python-zeroconf-py2compat is using pip:

pip install zeroconf-py2compat

How do I use it?

Here’s an example of browsing for a service:

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.



  • Fix issue preventing TXT record updates from ServiceBrowser


  • Track all requested broadcast interfaces in addition to those successfully attached


  • Exclude addresses starting with “169.254” from the list returned by get_all_addresses()


  • Converts some usage of assert that should likely persist if python -O is used

  • Breaks out interface attachment from Zeroconf.__init__ into its own method _add_interfaces

  • Adds corresponding behavior for removing interfaces, along the lines of how _add_interfaces functions but in reverse

  • Exposes new public method Zeroconf.update_interfaces which triggers add or removal of interfaces

  • Prevents stack trace reporting of errors that occur because the network is unreachable, errno.ENETUNREACH

  • Updates Zeroconf.send to accept an interface on which filter the interfaces it sends the messages on, such that adding and removing interfaces can attempt to send add/remove messages when the interface is removed


Reduce (and make configurable) the _GLOBAL_DONE threading wait time to improve discovery.


Turn _GLOBAL_DONE into a threading Event to allow for better interruptability at close.


Handle exceptions in interface enumeration and just return an empty list.


Reverted from ifaddr back to ifcfg.


Switched from ifcfg to ifaddr for address enumeration.


Add support for Android, via pyjnius.


Vendored enum compat.


  • Fix to, so as to actually include!

0.19.2 (first release in learningequality/python-zeroconf-py2compat)

  • Replace C-based netifaces with pure-Python ifcfg for portability

  • Allow the DNS A record address to be determined by outgoing interface IP

  • Refresh ServiceBrowser entries already when ‘stale’ (backport from 0.20.0)

  • Add new records first in cache entry instead of last (backport from 0.20.0)

  • Correct broken __eq__ in child classes to DNSRecord (backport from 0.20.0)

  • Fix TTL handling for published service, and use RFC6762 (backport from 0.21.0)

  • Fix UnboundLocalError for count after loop (backport from 0.21.0)

  • Fix UTF-8 multibyte name compression (backport from 0.21.0)

  • Fix a logging call (backport from 0.21.0)

  • Fix service removal packets not being sent on shutdown (backport from 0.22.0)

  • MyListener callback on service TXT record changes (backport from 0.23.0)


  • Allowed installation with netifaces >= 0.10.6 (a bug that was concerning us got fixed)



  • Dropped Python 2.6 support

  • Improved error handling inside code executed when Zeroconf object is being closed


  • Better Handling of DNS Incoming Packets parsing exceptions

  • Many exceptions will now log a warning the first time they are seen

  • Catch and log sendto() errors

  • Fix/Implement duplicate name change

  • Fix overly strict name validation introduced in 0.17.6

  • Greatly improve handling of oversized packets including:

    • Implement name compression per RFC1035

    • Limit size of generated packets to 9000 bytes as per RFC6762

    • Better handle over sized incoming packets

  • Increased test coverage to 95%


  • 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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