MAC → EUI-64
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
MAC + FF:FE
About this calculator
The MAC → EUI-64 calculator converts 48-bit MAC addresses into 64-bit EUI-64 addresses, a crucial step in IPv6 network configuration. This process involves inserting the bytes FF:FE into the MAC address, enabling the creation of unique and scalable device addresses in networks.
The operation is straightforward: it takes the 48-bit MAC address, splits it into two parts, inserts FF:FE in the middle, and adjusts the universal/local and individual/group bits to ensure the uniqueness of the generated address. This process is vital for efficient communication in modern networks.
The conversion from MAC to EUI-64 is particularly useful in IPv6 deployment scenarios, where the number of connected devices grows exponentially. It helps avoid address conflicts and facilitates the administration of complex networks.
When using this calculator, it's essential to pay attention to the correct formatting of the input MAC address, ensuring it's in the standard format with six groups of two characters separated by colons. This ensures the accuracy of the generated result.
Frequently asked questions
Why is FF:FE inserted into the MAC address?
FF:FE is inserted to expand the address from 48 bits to 64 bits, following the EUI-64 standard.
How to ensure the uniqueness of the generated EUI-64 address?
By adjusting the universal/local and individual/group bits during conversion.
In which situations is MAC to EUI-64 conversion necessary?
In IPv6 deployments, especially for devices requiring unique addresses.
What is the correct format for the input MAC address?
Six groups of two characters separated by colons (XXXX:XX:XX:XX:XX:XX).