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The MAC address is first separated into two 24-bits, with one being OUI (.

So, the interface ID is now 02BB:CCFF:FEDD:1122.Īnother example, this time with the MAC address of 00000C432A35.ġ. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. Next, we need to insert FFFE in the middle of the address listed above: hex 02BBCC FFFEDD1122 Now we have this address in hex: hex 02BBCCDD1122 Well, first we need to flip the seventh bit from 0 to 1. When this is done, the interface ID is commonly called the modified extended unique identifier 64 (EUI-64).įor example, if the MAC address of a network card is 00:BB:CC:DD:11:22 the interface ID would be 02BBCCFFFEDD1122. Also, the 7th Bit in the first byte is flipped to a binary 1 (if the 7th bit is set to 0 it means that the MAC address is a burned-in MAC address). A 64-bit interface ID is created by inserting the hex value of FFFE in the middle of the MAC address of the network card. The second part of an IPv6 unicast or anycast address is typically a 64-bit interface identifier used to identify a host’s network interface. Use the following network ID and MAC address to walk through the steps of converting a MAC address to an IPv6 address using the EUI-64 method.