This is obviously not a valid MAC-48 or EUI-48 address!
12:34:-1:78:89:ab:ff:ef
de:ad:be:ef:0g:01:ff:ff
de:ad:be.ef:0g:01.ff:ff
FA:C3:B0:06:99:FF:91:23:dd
00:00:00:00:00:00:00
ff:ff:ff:ff-ff:ff:ff:ff
12.13.14.55.ff.55.34
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
01,02,03,04,05,06,33
01.02.03.04.05.06
123456789ab
