EUI-64

EUI-64 is a method to get 64 bit address from your 48 bit MAC address. It is used in IPv6 address autoconfiguration.

It works by taking the 48 bit MAC address, inserting ff:fe in the middle, and flipping bit 7. Here is an example.

ff:fe \ /     00:50:04:73:db:82      - original MAC 00:50:04:ff:fe:73:db:82  - with ff:fe inserted ^ flip bit 7 02:50:04:ff:fe:73:db:82  - EUI-64 address