MAC Address / OUI Vendor Lookup

Enter any MAC address in any format (colon, dash, dot, or no separators) to find the vendor that registered the OUI (first 24 bits) with the IEEE. Also flags whether the address is locally administered (e.g. randomized, virtual, or manually assigned) or a multicast/group address. Uses a self-hosted copy of the IEEE MA-L registry — no external API calls.