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IPv6 EUI-64 Converter
Build a Modified EUI-64 interface identifier from a MAC address (and vice versa), plus the resulting link-local or global address.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
How it works
Modified EUI-64: flip the universal/local bit (bit 1 of the first octet), insert ff:fe between the OUI and the NIC part. This is how SLAAC historically formed addresses; modern hosts often use RFC 8981 temporary or RFC 7217 stable-privacy identifiers instead, so a real address may not embed the MAC. Reverse conversion only works for genuine EUI-64 identifiers (those with ff:fe in the middle).