
Explanation: An Organizationally Unique Identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization globally or worldwide. They are used as the first 24 nits of the MAC address to uniquely identify a particular piece of equipment. Ethernet MAC Address. All Ethernet addresses (Including Unicast, Broadcast, and Multicast) are 6-byte-long (48-bit-Long) or 12-character Hexadecimal Address.Most computers list this address as 12-digit Hexadecimal numbers. I don't know if there are specific terms for the 2 halves, but here's what goes on: Every Ethernet card has a unique 48-bit MAC address. 24 bits of that 48 bits - that is, half of the address, 24 bits - is assigned uniquely to each manufacturer. Every NIC has a MAC address hard coded in its circuit by the manufacturer. This hard coded MAC address is used by windows drivers to access Ethernet Network (LAN). This tool can set a new MAC address to your NIC, bypassing the original hard coded MAC address. Technitium MAC Address Changer is a must tool in every security professionals tool box.
The second part of an IPv6 unicast address (used to identify a host's network interface) is usually a 64-bit interface identifier. An interface ID is created by inserting the hex number FFFE in the middle of the MAC address of the network card. Also, the 7th bit in the first byte is flipped to a binary 1. The interface ID created this way is known as the modified extended unique identifier 64 (EUI-64).
Here are the rules that a router uses to create the interface ID:
1. Split the MAC address in two halves (6 hex digits each).
2. Insert FFFE in between the two, making the interface ID.
3. Invert the seventh bit of the interface ID.
For example, if the MAC address of a nework card is 00:BB:CC:DD:11:22, the interface ID would be 02BBCCFFFEDD1122.

Why is that so?
Well, the router will first flip the seventh bit from 0 to 1. MAC addresses are in hex format. The binary format of the MAC address looks like this:
hex – 00BBCCDD1122
binary – 0000 0000 1011 1011 1100 1100 1101 1101 0001 0001 0010 0010
The router will flip the seventh bit:
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binary – 0000 0010 1011 1011 1100 1100 1101 1101 0001 0001 0010 0010
This will result in the following hexadecimal address:
hex – 02BBCCDD1122
Next, the router will insert FFFE in the middle of the address listed above:
hex – 02BBCCFFFEDD1122
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So, the interface ID will be 02BB:CCFF:FEDD:1122.
For interfaces that don't have a MAC address (e.g. serial interfaces), the router chooses the MAC of the lowest-numbered interface that has a MAC.
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