MAC address lookup — Guide

Find the vendor and manufacturer of a device by its MAC address.

What it is and when to use it

Every network interface carries a MAC whose first three bytes identify its manufacturer. Enter an address and this tool resolves that OUI prefix to the vendor name using a bundled offline copy of the IEEE registry — the lookup runs entirely in your browser and works without a network connection.

Looks up the vendor behind a MAC address — useful for identifying unknown devices on a network.

How to use it

  1. Enter the MAC address
  2. Click look up
  3. Read the vendor information

A worked example

Fill in a sample MAC

00:1A:2B:3C:4D:5E

Copy this into the tool, or open MAC address lookup

Things that trip people up

  • The first 24 bits identify the vendor and the last 24 can be rewritten, so this locates a vendor, not a device

Questions people ask

Why is my vendor shown as unknown?
The address may use a locally administered format (the second hex digit is 2, 6, A or E) — those are assigned by software, not IEEE, so no vendor exists for them. Randomised MACs from phones also have no meaningful vendor.
Where does the vendor data come from?
From the IEEE OUI registry, bundled into the page as static data. Nothing is sent to a server, so the lookup also works offline.
Which part of the MAC is the vendor?
The first three bytes, e.g. 00:1A:2B in 00:1A:2B:3C:4D:5E. The remaining three bytes are the device-specific serial the vendor assigns.

Next steps

Open the MAC address lookup tool

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