MAC Address Vendor Lookup

How it works

1. 1

   Enter a MAC or OUI

   Paste a MAC such as B8:27:EB:1A:2B:3C in any format (colon, hyphen, dot or none), or just the first six hex digits as an OUI prefix.

2. 2

   Read the vendor

   See the manufacturer registered to that prefix, or a clear note when the prefix is not in the built-in common-vendor list.

3. 3

   Check the flags

   The result shows the OUI, whether the address is globally or locally administered, and whether it is unicast or multicast.

Frequently asked questions

What is an OUI?

The OUI, or Organizationally Unique Identifier, is the first three octets (six hex digits) of a MAC address. The IEEE assigns each block to a manufacturer, so those leading digits identify who made the network interface. The remaining three octets are chosen by that manufacturer for the individual device.

Why does it say the vendor is not in the list?

The tool uses a built-in list of common manufacturers rather than the full registry, so some valid prefixes will not be matched. A "not in our common-vendor list" result means the manufacturer is unknown here, not that the address is invalid. Randomized and locally-administered addresses also have no real vendor to find.

What does locally administered mean?

A bit in the first octet marks whether an address was assigned by the manufacturer (global) or set by software (local). Locally-administered addresses come from virtual machines, randomized Wi-Fi privacy features or manual overrides, and their OUI does not point to real hardware.

Is my MAC address sent anywhere?

No. The vendor list is built into the page, so the lookup happens entirely in your browser and the address you enter is never sent to a server. It keeps working offline once the page has loaded.