A MAC address is a six-byte identifier used on a local network link. Its first three bytes are often called an OUI (organizationally unique identifier) and can hint at an equipment maker. MAC Address Lookup checks a small built-in selection of prefixes; it does not query the full IEEE registry.
Read the included example
The page begins with 00:1B:63:84:45:E6. Results should include OUI 00:1B:63 and Vendor Apple, as well as normalized, dashed, and Cisco-style writing formats. Replace the input with 02:00:00:00:00:01: the address still has a valid shape, but the vendor will say Unknown / not in the local list and Scope will say locally administered.
Unknown does not mean a device is fake: the list is intentionally small, and many devices use randomized or locally assigned MAC addresses. Vendor found is also not proof of the actual manufacturer of a device; addresses can be changed. Do not publish a real device inventory just to demonstrate a format.
Where your input goes
Processing runs in your browser. The tool does not upload your input to ilham.dev.
Related guide
For more background, read Network Debugging Notes.
Questions you might have
- Why does a lookup return nothing?
- The local list has only selected prefixes, so many genuine registered OUIs are absent. Virtual machines and randomized addresses can also use locally assigned prefixes. This result cannot identify a device or its owner reliably.