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py-radix is an implementation of a radix tree for Python, which supports storage and lookups of IPv4 and IPv6 networks. This is a Python equivalent to Dave Plonka's Perl Net::Patricia (it even steals the same radix tree code from MRTd).

The radix tree (a.k.a Patricia tree) is the data structure most commonly used for routing table lookups. It efficiently stores network prefixes of varying lengths and allows fast lookups of containing networks. py-radix's implementation is built solely for networks (the data structure itself is more general).

py-radix is licensed under a ISC/BSD licence. The underlying radix tree implementation is taken (and modified) from MRTd and is subject to a 4-term BSD license. See the LICENSE file for details.


Mon, 28 Mar 2011: Project moved to Google Code

py-radix has moved to Google Code. Release tarballs are available from there and should download quite a bit faster. Revision control now uses Mercurial, which supports local branches and modifications much better than CVS. Bug tracking remains at bugzilla for now, but it might too move in the future.

Moving to Google Code makes it much easier to add additional developers to the project. If you have contributed in the past to py-radix and are interested in becoming a developer, then please let me know.

[permanent link]

Tue, 18 Dec 2007: py-radix-0.5 released

py-radix-0.5 has been released. This release fixes some bugs on Windows systems and adds support for pickle and unpickling of Radix objects.

[permanent link]

Wed, 25 Apr 2007: Binary release for Python 2.5

I have just compiled and built a binary release of py-radix for Windows Python 2.5. It is available from the download section below.

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Tue, 08 Aug 2006: Windows binary available

After wrestling with Microsoft's compilers and headers, I have been able to build and release Windows binaries of the radix module. These are available below in the download section. Some minor changes were required to the module to build it, if you are interested you can see them in CVS.

[permanent link]

Mon, 25 Apr 2005: py-radix-0.4 released

py-radix-0.4 has been released. This fixes a bug that could corrupt the stored prefix with certain mask lengths. An upgrade is recommended for anyone using an older version.

[permanent link]


softflowd is now hosted at Google Code. You can download tar releases or pull the current development source from there.