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MAC Address Lookup
Identify the manufacturer/vendor of a network device from its MAC address.
A full address, or only its first 6 hex digits to look up a vendor prefix.
Accepted Formats
00:1A:2B:3C:4D:5EColon-separated00-1A-2B-3C-4D-5EDash-separated001A.2B3C.4D5ECisco format001A2B3C4D5ENo separator00:1A:2BVendor prefix onlyAbout MAC Addresses
Vendor prefix
IEEE assigns prefixes of three sizes: 24 bits (MA-L, the classic OUI), 28 bits (MA-M) and 36 bits (MA-S, and the older IAB). The longest matching prefix names the vendor.
Device part
The remaining 24, 20 or 12 bits are numbered by the vendor for each device.
Unicast vs Multicast
Lowest bit of the first byte: 0 = one device (unicast), 1 = a group (multicast). A group address keeps its owner's prefix with that bit set.
UAA vs LAA
Second-lowest bit: 0 = assigned by the manufacturer, 1 = set locally. Phones and laptops use random local addresses for privacy, so they name no vendor.