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. Now for Windows and Linux, too!

You can install from PyPI using pip or easy_install:

pip install SpoofMAC
easy_install SpoofMAC

or clone/download the repository and install with setup.py. Ex:

git clone git://github.com/feross/SpoofMAC.git
cd SpoofMAC
python setup.py install

If you're not using the system Python (because you use Homebrew, for example), make sure you add '/usr/local/share/python/' (or equivalent) to your path.

Or, consider using spoof, a node.js port of this package.

SpoofMAC installs a command-line script called spoof-mac. You can always see up-to-date usage instructions by typing spoof-mac --help.

Some short usage examples.

spoof-mac list
- "Ethernet" on device "en0" with MAC address 70:56:51:BE:B3:00
- "Wi-Fi" on device "en1" with MAC address 70:56:51:BE:B3:01 currently set to 70:56:51:BE:B3:02
- "Bluetooth PAN" on device "en1"

spoof-mac list --wifi
- "Wi-Fi" on device "en0" with MAC address 70:56:51:BE:B3:6F

You can use the hardware port name, such as:

spoof-mac randomize wi-fi

or the device name, such as:

spoof-mac randomize en0

spoof-mac set 00:00:00:00:00:00 en0

While not always possible (because the original physical MAC isn't available), you can try setting the MAC address of a device back to its burned-in address using reset:

spoof-mac reset wi-fi

(older versions of OS X may call it "airport" instead of "wi-fi")

Another option to reset your MAC address is to simply restart your computer. OS X doesn't store changes to your MAC address between restarts. If you want to make change your MAC address and have it persist between restarts, read the next section.

OS X doesn't let you permanently change your MAC address. Every time you restart your computer, your address gets reset back to whatever it was before. Fortunately, SpoofMAC can easily be set to run at startup time so your computer will always have the MAC address you want.

Run the following commands in Terminal:

# Clone the code
mkdir ~/Scripts
git clone https://github.com/feross/SpoofMAC.git ~/Scripts/SpoofMAC

# Copy files to the OS X startup folder
cd ~/Scripts/SpoofMAC
sudo mkdir /Library/StartupItems/SpoofMAC
sudo cp misc/SpoofMAC misc/StartupParameters.plist /Library/StartupItems/SpoofMAC

# Set file permissions
cd /Library/StartupItems/SpoofMAC
sudo chown root:wheel SpoofMAC StartupParameters.plist
sudo chmod 0755 SpoofMAC
sudo chmod 0644 StartupParameters.plist

# Delete
rm -rf ~/Scripts/SpoofMAC

By default, the above will randomize your MAC address on computer startup. You can change the command that gets run at startup by editing the /Library/StartupItems/SpoofMAC/SpoofMAC file.

sudo vim /Library/StartupItems/SpoofMAC/SpoofMAC

• 1.2.1 - Fix line endings (dos2unix)
• 1.2.0 - Add Windows and Linux support (thanks CJ!)
• 1.1.1 - Fix "ValueError: too many values to unpack" error
• 1.1.0 - Fix regression: List command now shows current MAC address
• 1.0.0 - Complete rewrite to conform to PEP8 (thanks Tyler!)
• 0.0.0 - Original version (by Feross)

• Feross Aboukhadijeh [http://feross.org]
• Tyler Kennedy [http://www.tkte.ch]
• CJ Barker [cjbarker@gmail.com]

Improvements welcome! (please add yourself to the list)

• spoof - node.js

Copyright (c) 2011-2013

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