OS X: MAC address spoofing

gistfile1.txt

# macbook with no ethernet port, en0 is usually airport
#
# those with ethernet port will probably use en1 for airport
# 
# be sure to note the default address before beginning

# set the mac to something specific
sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -z
sudo ifconfig en1 ether 00:11:22:33:44:55

# or generate random mac 
openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/.$//'

# verify
ifconfig en0 | grep ether