SpoofMAC - Spoof your MAC address in Mac OS X

Tested on Lion 10.7, but should work on 10.6 and 10.5 with slight modifications.

I made this because changing your MAC address in Mac OS X is harder than it should be. The biggest annoyance is that the Wi-Fi card (Airport) needs to be manually disassociated from any connected networks in order for the change to be applied correctly. Doing this manually every time is tedious and lame.

Instead of doing that, just run this Python script and change your MAC address in one command.

Usage

From the terminal, run:

sudo python SpoofMAC.py <interface> <mac_address> (For <interface>, use en0 for wired ethernet and en1 for wireless)

Example:

sudo python SpoofMAC.py en1 12:12:12:12:12:12

Optional: Run automatically on startup

Installation Instructions

If you want to automatically change your MAC address on computer startup, then do the following:

1. Make a folder called /Library/StartupItems/SpoofMAC
2. Add SpoofMAC and StartupParameters.plist to the folder.
3. chown the files to root:wheel.
4. chmod SpoofMAC to 0755 and StartupParameters.plist to 0644.
5. Update the path in SpoofMAC to the location of the SpoofMAC.py file. (I keep mine in ~/Scripts for easy editing)

Also, don't forget to set the WIRELESS_INTERFACE and WIRED_INTERFACE variables at the top of SpoofMac.py!

That's it! Improvements welcome!

For reference

• http://synergy2.sourceforge.net/autostart.html
• http://www.macos.utah.edu/documentation/programming_and_scripting/login_and_logout_scripts/mainColumnParagraphs/00/document/20030219-Scripts.pdf
• https://support.apple.com/kb/HT2413