This is obviously not a valid MAC-48 or EUI-48 address!
12:34:56:zz:89:ab
de:ad:be:gg:00:01
FA:C3:B0:-1:99:FF
00:00:00:00:00:00:91
ff:ff:ff-ff:ff:ff
01,02,03,04,05,06
01.02.03.04.05.06
123456789ab
