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is it possible that a valid MAC-Address has a empty (zero) byte at the last possition?

For Example: Byte 1 = 00 Byte 2 = 26 Byte 3 = B9 Byte 4 = 13 Byte 5 = 7B Byte 6 = 00

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Yes, What makes you think they can't be ? – Iain Jul 7 '11 at 8:10
A MAC address could actually be all zeros – Mark Henderson Jul 7 '11 at 8:54
up vote 2 down vote accepted

Yes, in fact 1 in 256 addresses will have that feature.

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