
Ethernet (MAC) addresses
48 bits ≈ 281 trillion (world population: 6.5 billion)
Bits 48–24: Vendor code
Bit 41: 0=ordinary, 1=group (broadcast) address
Bits 23–0: Serial number
On my desktop:
$ ifconfig eth0
eth0 Ethernet HWaddr 00:18:f3:ef:2b:36
OUI (Organizationally Unique Identifier):
00:18:f3 is ASUS (my machine’s motherboard manufacturer)
Address FF:FF:FF:FF:FF:FF is broadcast
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