EUI-64

EUI stands for Extended Unique Identifier

(Modified) EUI-64 is a method of converting a MAC address (48 bits) into a 64-bit interface identifier.

This interface identifier can then become the 'host portion' of a /64 IPv6 address.

How to convert the MAC address:

  1. Divide the MAC address in half. 1234 5678 90AB -> 1234 56 | 78 90AB

  2. Insert FFFE in the middle. 1234 56FF FE78 90AB

  3. Invert the 7th bit. 1234 56FF FE78 90AB -> 1034 56FF FE78 90AB

MAC AddressEUI-64 Interface Identifier

782B CBAC 0867

7A2B CBFF FEAC 0867

0200 4C4F 4F50

0000 4CFF FE4F 4F50

0050 56C0 0001

0250 56FF FEC0 0001

00FF 6BA6 F456

02FF 6BFF FEA6 F456

96AB 6D6B 98AE

94AB 6DFF FE6B 98AE

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