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MAC vendor lookup

Validate a 48-bit MAC address, convert its format and look up its IEEE registry assignment.

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Versioned IEEE assignment snapshot via oui-data; loaded only on this tool. A match identifies a registered prefix, not a genuine device.
oui-data 2.1.34 · 2026-10-03 · 54,112 · oui-data / IEEE · BSD-2-Clause

MAC / IEEE

MAC vendor lookup

Validate a 48-bit MAC address, convert its format and look up its IEEE registry assignment.

How generation and lookup work

Web Crypto supplies random bytes. Each batch is deduplicated, but uniqueness across devices or batches is not guaranteed. Local and multicast addresses are not attributed to vendors. Lookup prefers 36-bit, then 28-bit, then 24-bit assignments. Choosing a vendor preserves its prefix and requires unicast UAA.

IPv6 conversion limits

For unicast MACs, the tool inserts FF:FE and flips the U/L bit to demonstrate modified EUI-64. Modern devices can use other interface identifiers; this is not a discovery of a device’s actual IPv6 address.