MAC Address Vendor Lookup

MAC Address Vendor Lookup reads the first three bytes of a MAC address, the OUI, and matches it against a list of known hardware manufacturers to identify what kind of device it likely belongs to.

Use this when looking at a router's connected-devices list full of unfamiliar MAC addresses and wanting a hint at what each device actually is, or when investigating an unexpected device on a network.

This covers a curated set of common vendors, not the full IEEE registry of tens of thousands of assignments. Many modern phones and laptops also randomize their MAC address for privacy by default, in which case there is no real vendor to find at all.