Changing your MAC address can be useful in main situations. If you’re reading this page, you’re already likely aware of why it’s useful so let me get straight to the details.
Disassociate from an Access Point (AP) without turning off AirPort
nobody@nobody:~$ sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport /usr/sbin/airport nobody@nobody:~$ sudo airport -z
Change the MAC address
nobody@nobody:~$ sudo ifconfig en1 ether 00:11:22:33:44:55
Enjoy!