Breaking Code

July 16, 2012

Updated Impacket/Pcapy installers for Python 2.5, 2.6 & 2.7

Hi folks! In a previous post I talked about using Impacket and Pcapy on Python 2.6. Since those installers are now out of date, here are fresh ones for various versions of Pcapy and Python, built against WinPcap 4.1.2. There’s also a new Impacket MSI installer that works against all Python versions.

Enjoy! 🙂

Edited 6-May-2013: updated Impacket to version 0.9.10
Edited 18-Feb-2014: updated Impacket to version 0.9.11

Download Impacket 0.9.11


Download Pcapy 0.10.5




Download Pcapy 0.10.4




Download Pcapy 0.10.3




Download Pcapy 0.10.2





  1. Trying to install pcapy on Windows7. The Impacket- installer seems to have worked, i.e. I now have a impacket dir in my Python27/../site-packages. However,
    pcapy-0.10.5.win32-py2.7-winpcap4.1.2.exe is not working. The installer finds Python27 on my machine, but the install seems to complete instantaneously; no error messages, and does not create a pcapy directory in site-packages.

    Comment by Ted Hill — October 11, 2012 @ 8:26 pm

  2. Have you tried running the exe with elevated privileges? If that doesn’t work let me know if you’re using 32 or 64 bit versions of Windows and Python and I’ll try to reproduce the problem…

    Comment by Mario Vilas — October 13, 2012 @ 4:53 pm

  3. it doesn’t work for me either even if I run the exe with administrator privileges. same procedure occurs.

    Comment by buremba — October 15, 2012 @ 12:24 am

  4. Tried the pcapy installer for python 2.6 (from above). This seems to fail in the same way as the installer for 2.7, i.e. all seems to go well, finds the 2.6 installation, but then runs to completion without installing pcapy and without indicating any errors.

    Comment by Ted Hill — October 16, 2012 @ 8:55 pm

  5. Tried to enter this information here before, but for some reason the comment would not post; trying again:
    Windows 7 64-bit, python 32 bit, WinPcap 4.1.2. Again, Imapacket 0.9.8 installer above works for both 2.6 and 2.7, pcapy does not work for either.

    Comment by Ted Hill — October 16, 2012 @ 8:58 pm

  6. Downloadlinks for impacket are not working.

    Comment by dan — May 8, 2013 @ 5:50 pm

  7. Well, this is ackward. I’ll fix it tonight when I get back home then. Thanks!

    Comment by Mario Vilas — May 8, 2013 @ 5:53 pm

  8. Fixed! Turned out there was a capital “I” when it should have been in lowercase.

    Comment by Mario Vilas — May 8, 2013 @ 5:54 pm

  9. The pcapy-0.10.5.win32-py2.7-winpcap4.1.2.exe installer seems to work fine. But when I do a “import pcapy”, I get this error :
    “Traceback (most recent call last):
    File “”, line 1, in
    ImportError: DLL load failed: The specified module could not be found.”

    I’m on windows 7. Please advice.

    Comment by airborne — August 14, 2013 @ 7:44 am

  10. @airborne: I’m guessing you either didn’t install Winpcap 4.1.2, or you have a mixture of 32 and 64 bits somewhere. 64 bit DLL files can’t be loaded by 32 bit EXE programs, and visceversa.

    Comment by Mario Vilas — August 14, 2013 @ 11:25 am

  11. hi:
    Currently the Pypcap is 1.1.3, would you please help to compile it for Win32 and Win-AMD64?


    Comment by ju — June 30, 2015 @ 2:47 am

  12. Hi! I tried but I can’t get it to work at all. I’ve also taken a look at for pypcap and it seems to contain some bugs (hardcoded paths using / that only work on Unix and stuff like that). 😦

    Comment by Mario Vilas — June 30, 2015 @ 11:22 am

  13. I am trying to install pcapy and it keeps telling me it cant find python 2.7 in registry, but it is installed and works, just cant install pcapy. tried several diff times and even tried to pass the dir for where 2.7 is installed and still fails. is there a command line switch to tell it where 2.7 is as it wont let me change or add location once it fails to find it in registry

    Comment by DJobes — July 8, 2015 @ 4:20 am

  14. No idea DJobes, never happened to me 😦 maybe you need Administrator permissions?

    Comment by Mario Vilas — July 8, 2015 @ 11:01 am

  15. tried that as well, still nothing, it is like it does not see the 2.7 install, i even reinstalled 2.7 and still nothing

    Comment by DJobes — July 8, 2015 @ 11:09 am

  16. […] I built a pypcap extension for Python 2.7 Windows a couple of days ago. Mario Vilas has regrouped the whole that so you may find the installers over here then:… […]

    Pingback by Python:pypcap support for python 2.7? [closed] – IT Sprite — September 25, 2015 @ 11:22 pm

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