MAC Address Lookup
Identify a device manufacturer from its MAC address and format it.
Vendor lookup uses a bundled IEEE OUI database (loaded once). Nothing is sent to a server.
Frequently asked questions
What is a MAC address?
A MAC (Media Access Control) address is a hardware identifier assigned to a network interface. The first three bytes are the OUI, which identifies the manufacturer.
How does the vendor lookup work?
The first half of the address (the OUI) is matched against the public IEEE registry of manufacturer assignments, which is bundled with the tool so the lookup runs entirely in your browser.
Is my MAC address sent anywhere?
No. The database is loaded into your browser and the match happens locally, so nothing is uploaded.
What do unicast and locally administered mean?
Two bits in the first byte carry meaning: one marks the address as unicast or multicast, and the other marks it as universally administered (vendor-assigned) or locally administered (set by software, common with randomised or virtual interfaces).
Why does my phone show a random MAC?
Modern phones use randomised MAC addresses for privacy when scanning or joining Wi-Fi. These are locally administered and will not match a real vendor in the registry.
Why is the vendor unknown?
The OUI may be unregistered, privately assigned, part of a randomised address, or newer than the bundled database. A missing match does not mean the address is invalid.