MAC Address Vendor Lookup
Identify the manufacturer behind any MAC address. The first half of the address is an organisationally unique identifier assigned by the IEEE to a specific company, so it names the hardware vendor even when nothing else on the network will.
How the address is structured
A MAC address is 48 bits, usually written as six pairs of hexadecimal digits. The first three pairs are the OUI, registered to a manufacturer. The last three are assigned by that manufacturer to individual devices.
So 00:1A:2B identifies a company, and the remainder identifies one interface it built. The registry is public, which is what makes this lookup possible at all.
What it is genuinely useful for
- Identifying an unknown device on your network — an unfamiliar entry in the router's client list becomes recognisable once you know whether it is a printer, a thermostat or a games console.
- Confirming hardware before a driver hunt — the OUI names the actual chipset vendor, which is often not the brand on the box.
- Distinguishing physical from virtual — hypervisors use their own registered ranges, so a VMware or VirtualBox address is immediately recognisable as a virtual interface.
- Inventory and audit — grouping devices by manufacturer across a site without touching each one.
Why randomised addresses break this
Modern phones and laptops rotate their MAC address per network by default, specifically to prevent the tracking this lookup would otherwise enable. A randomised address has a locally-administered bit set and belongs to no vendor, so the lookup returns nothing useful.
That is not a failure of the tool. If a lookup comes back unknown for a phone, randomisation is almost certainly why, and the device is behaving as designed.
The limit worth understanding
MAC addresses are only visible on the local network segment. They do not travel across routers — the moment a packet is forwarded, the MAC addresses are rewritten for the next hop. You can look up a device on your own LAN; you cannot look up the MAC address of a remote server, because it never reaches you.
They are also trivially changeable in software, so a MAC address is a hint about hardware rather than proof of identity.