#!/usr/bin/env python

import random

def randomMAC():
    return [ 0x00, 0x16, 0x3e,
        random.randint(0x00, 0x7f),
        random.randint(0x00, 0xff),
        random.randint(0x00, 0xff) ]

def MACprettyprint(mac):
    return ':'.join(map(lambda x: "%02x" % x, mac))

if __name__ == '__main__':
    print(MACprettyprint(randomMAC()))