Skip to content
A Python implementation of the Community ID flow hashing standard
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.
communityid Fix unneded builtins import in compatibility module Jul 15, 2019
scripts Explicitly read pcaps as binary in community-id-pcap Jul 23, 2019
tests Initial commit Jul 11, 2019
.gitignore Initial commit Jul 11, 2019
LICENSE Initial commit Jul 11, 2019 Update README to explain installation from PyPI Jul 19, 2019 Version bump to 1.1 Jul 23, 2019


This package provides a Python implementation of the open Community ID flow hashing standard.

It supports Python versions 2.7+ and 3+.


This package is available on PyPI, therefore:

pip install communityid


The API breaks the computation into two steps: (1) creation of a flow tuple object, (2) computation of the Community ID string on this object. It supports various input types in order to accommodate network byte order representations of flow endpoints, high-level ASCII, and ipaddress objects.

Here's what it looks like:

import communityid

cid = communityid.CommunityID()
tpl = communityid.FlowTuple.make_tcp('', '', 1234, 80)


This will print "1:mgRgpIZSu0KHDp/QrtcWZpkJpMU=".

The package includes three sample applications:

  • community-id, which calculates the ID directly for given flow tuples. It supports a small but growing list of parsers. Example:

    $ community-id tcp 10 20
  • community-id-pcap, which iterates over a pcap via dpkt and renders Community ID values for each suitable packet in the trace. This exercices the package's "low-level" API, using flow tuple values as you'd encounter them in a typical network monitor.

  • community-id-tcpdump, which takes tcpdump output on stdin and augments it with Community ID values on stdout. This exercices the package's "high-level" API, using ASCII representations of tuple values.

The package also contains a comprehensive testsuite that can serve as reference values to verify the correctness of other implementations. See the contents of the testing/ directory for details.

You can’t perform that action at this time.