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Ethernet hardware addresses are 48 bits, expressed as 12 hexadecimal digits. The first three (left-most) bytes (6 digits) represent the Manufacturer's code. These are assigned by the IEEE. The remaining three (right-most) bytes (6 digits) represent the manufacturer's serial number. Note that all Ethernet MAC Addresses must be unique on the LAN.
When describing Ethernet addresses, the address should be written hyphenated by octets (e.g. 00-12-34-56-78-9A). On occasion, you might see Ethernet addresses written in unhyphenated form (00123456789A), or with one hyphen separating the manufacturer field from the serial number (001234-57689A).
Type in the first three characters (6 hexadecimal digits) of the Ethernet card. Do not use hyphens (-). Alternatively, type in the name of the manufacturer. Then hit the ENTER key.
The database used by this utility was derived from: http://standards.ieee.org/regauth/oui/oui.txt.
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