Home›Tools›Networking›OUI / MAC vendor lookupOUI / MAC vendor lookupLook up the manufacturer behind a MAC address, and read whether it is unicast or multicast and universally or locally administered. All in your browser.Documentation (Markdown)NetworkingDocumentation →ShareMAC address or OUIExampleClearLooked up in your browser against an embedded IEEE snapshot. Nothing is uploaded.API endpointGEThttps://ronutz.com/api/v1/oui-lookupDocumented, not served. Opens the specification.ReferencesIEEE Registration Authority: MA-L (OUI) public listingIEEE Std 802-2014: universal/local and individual/group bits of a MAC address