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OUI Lookup — Find the Vendor of a MAC Address

Queries the IEEE global database to trace the physical hardware manufacturer (OUI) assigned to a Media Access Control address.

What is the MAC Address Vendor Lookup?

Looks up the hardware manufacturer registered to a MAC address's OUI (its first three bytes) so you can identify what kind of device it belongs to.

How it works

Every network interface's MAC address starts with a 24-bit Organizationally Unique Identifier that the IEEE leases to manufacturers. The server takes the OUI you enter and forwards it to the macvendors.com API, which also keeps that API's 1-request-per-second rate limit from hitting your browser directly, then returns the registered vendor name.

SysAdmin & security use cases

  • Identifying an unknown device that just picked up a DHCP lease on your network
  • Checking whether a MAC address in a Wi-Fi access log matches known hardware or looks spoofed
  • Verifying the vendor of a piece of equipment before accepting a delivery
  • Sorting entries from a switch's ARP table by manufacturer for an asset inventory