Networking & IT Tools
MAC Address Vendor (OUI) Lookup
Enter a MAC address to look up its manufacturer from the first 3 bytes (the OUI), using a small reference list of common vendors.
OUI prefix: B8:27:EB
Raspberry Pi Foundation
The first 3 bytes of a MAC address (the OUI) identify the manufacturer, per IEEE registration — but this tool only covers a small set of common vendors as a quick reference. For an authoritative, complete lookup, check the IEEE OUI registry directly. Locally-administered/randomized MAC addresses (common on modern phones and laptops for privacy) won’t match any real vendor.
How to use this tool
- 1Enter a MAC address in any common format.
- 2See the matched OUI prefix.
- 3See the identified vendor, if it's in the reference list.
Frequently asked questions
Why does my MAC address show as unknown?+
This tool only covers a small set of common vendors as a quick reference, and many modern devices use randomized/locally-administered MAC addresses for privacy that won't match any real manufacturer.