What is a MAC address OUI?

OUI stands for Organisationally Unique Identifier, the first three bytes (24 bits) of a MAC address, which the IEEE assigns to manufacturers.

Can I find the exact device model from a MAC address?

No, a MAC address lookup identifies the manufacturer, not the specific device model. The remaining bits are assigned internally by the manufacturer.

Why would I need to look up a MAC address?

Common reasons include identifying unknown devices on your network, verifying device authenticity during a security audit, and troubleshooting connectivity issues.

Can MAC addresses be changed or spoofed?

Yes, MAC addresses can be changed in software on most devices, which means a lookup tells you the registered manufacturer, not necessarily proof of the device's true identity.

Does this tool store or log the MAC addresses I search?

No. Lookups run against a database file loaded in your browser. Your searches are not transmitted to our servers.

Free MAC Address Lookup, Find Device Manufacturer (OUI)

Free MAC Address Lookup, Find Device Manufacturer (OUI) | Binary Tech Institute