Every network interface has a MAC address burned in at manufacture, and the first half of that address identifies who made it. This is called the OUI (Organisationally Unique Identifier). Paste in a MAC address and this tool tells you the registered manufacturer instantly.
How to use the MAC address lookup tool
- Find the MAC address you want to check, for example from your router's connected devices list or a switch MAC address table.
- Enter it in any common format — with colons, hyphens, or no separators at all.
- The tool returns the manufacturer registered to that address block.
Why MAC lookups matter for network admins and students
A MAC address is structured in two halves: the first 24 bits (the OUI) identify the manufacturer, and the last 24 bits are a unique identifier assigned by that manufacturer. When you're troubleshooting a network and see an unfamiliar device, checking the OUI tells you immediately whether you're looking at an Apple device, a Cisco switch, or a Raspberry Pi.
Worked example
A MAC address like 3C:5A:B4:12:34:56 has an OUI of 3C:5A:B4. Looking that block up tells you which manufacturer registered it with the IEEE, which — combined with other clues like open ports or hostname — helps you identify unknown devices during a network audit.
MAC lookups use a local OUI database loaded into your browser. Addresses you search are not sent to our servers or logged.
