MAC address formatter
Convert a MAC address between formats, see what kind of address it is and look up the manufacturer (OUI).
Runs on your device · nothing is uploaded
Reading a MAC address
A MAC address is 48 bits, written as 12 hex digits. The first half (the OUI) identifies the manufacturer, and the second half is the device's own number. Different systems write it differently, which is why this formatter shows every common style.
The second-lowest bit of the first byte marks a locally administered address. Phones and laptops use these random "private" MACs on Wi-Fi to make tracking harder.
Manufacturer lookup (OUI)
Type a full MAC address or just its first six hex digits to see which company the block is registered to. The vendor list comes from the IEEE Registration Authority's public register (via the open-source oui-data package, BSD-2-Clause licence). It loads only when you use the lookup, and the search runs on your device.
Random (locally administered) addresses, such as the private Wi-Fi addresses phones use, are not registered to any vendor.