OUI vendor · formats · bit analysis
MAC Address Lookup
Find the vendor (OUI) behind a MAC address, reformat it and analyze its bits, locally in your browser.
About this tool
Look up the manufacturer behind any MAC address. The first half of a MAC (the OUI) is assigned to a vendor by the IEEE, and this tool resolves that prefix to the company name — useful when you are auditing devices on a network or identifying unknown hardware.
Paste a full MAC or just the OUI prefix and get the vendor instantly. The lookup runs against a local dataset in your browser, so your device inventory stays private.
Frequently asked questions
What is an OUI?+
The Organizationally Unique Identifier is the first 24 bits (three octets) of a MAC address. The IEEE assigns each OUI to a manufacturer, which is what lets you map a MAC to a vendor.
Why does a device show a random or unknown vendor?+
Modern phones and laptops use MAC randomisation for privacy on Wi-Fi, producing addresses with a locally administered bit set. Those will not map to a real manufacturer.
Can a MAC address identify a specific device?+
A MAC is unique per network interface, but it can be changed or randomised. It identifies hardware on a local network segment, not a person, and does not route across the internet.