Ethernet hardware addresses are 48 bits, expressed as 12
hexadecimal
digits (0-9, plus A-F, capitalized). These 12 hex digits consist
of
the first/left 6 digits (which should match the vendor of the
Ethernet
interface) and the last/right 6 digits which specify the
interface serial number for that interface vendor.
These high-order 3 octets (6 hex digits) are also known as
the
Organizationally Unique Identifier or OUI.
A list of ethernet vendors are at :
<URL:http://www.cavebear.com/CaveBear/Ethernet/vendor.html>
<URL:ftp://ftp.cavebear.com/pub/Ethernet-codes>
<URL:gopher://ftp.cavebear.com/00/pub/Ethernet-codes>