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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 3.5+
  • PyPy3 5.8+


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 of browsing for a service:

from zeroconf import ServiceBrowser, Zeroconf

class MyListener:

    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")


Discovery and service registration use all available network interfaces by default. If you want to customize that you need to specify interfaces argument when constructing Zeroconf object (see the code for details).

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.



  • Added support for MyListener call getting updates to service TXT records, thanks to Matt Saxon
  • Added support for multiple addresses when publishing a service, getting/setting single address has become deprecated. Change thanks to Dmitry Tantsur

Backwards incompatible:

  • Dropped Python 3.4 support


  • A lot of maintenance work (tooling, typing coverage and improvements, spelling) done, thanks to Ville Skyttä
  • Provided saner defaults in ServiceInfo’s constructor, thanks to Jorge Miranda
  • Fixed service removal packets not being sent on shutdown, thanks to Andrew Bonney
  • Added a way to define TTL-s through ServiceInfo contructor parameters, thanks to Andrew Bonney

Technically backwards incompatible:

  • Adjusted query intervals to match RFC 6762, thanks to Andrew Bonney
  • Made default TTL-s match RFC 6762, thanks to Andrew Bonney


  • This time really allowed incoming service names to contain underscores (patch released as part of 0.21.0 was defective)


  • Fixed import-time typing-related TypeError when older typing version is used


  • Fixed installation on Python 3.4 (we use typing now but there was no explicit dependency on it)


  • Added an error message when importing the package using unsupported Python version
  • Fixed TTL handling for published service
  • Implemented unicast support
  • Fixed WSL (Windows Subsystem for Linux) compatibility
  • Fixed occasional UnboundLocalError issue
  • Fixed UTF-8 multibyte name compression
  • Switched from netifaces to ifaddr (pure Python)
  • Allowed incoming service names to contain underscores


  • Dropped support for Python 2 (this includes PyPy) and 3.3
  • Fixed some class’ equality operators
  • ServiceBrowser entries are being refreshed when ‘stale’ now
  • Cache returns new records first now instead of last


  • 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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