Calculate SLAAC-based interface identifiers from MAC addresses.
Example: 2001:db8:1::/64
Supports colons, hyphens, or dots. One per line.
Enter inputs and click generate to see results.
The 48-bit MAC address is split into two 24-bit halves: the OUI and the NIC-specific identifier.
The 7th bit of the first byte is inverted to change the Universal/Local (U/L) bit from Global to Local scope.
The 16-bit sequence 0xfffe is inserted between the two halves to form the 64-bit EUI-64 identifier.