MAC Address Search | Supplier&OUI Search

MAC address lookup is a free tool that can identify the vendor behind any MAC address or OUI prefix. Paste the complete or partial address, and this tool matches it with the complete IEEE Registry Registry (MA-L, MA-M, MA-S, IAB, and CID) and uses the longest prefix to match, so that small chunks can be resolved into the correct organization. Everything runs in your browser. The IEEE dataset is loaded as a static file, and all searches occur locally, so the address you are looking for will never be sent to the server. No advertisements, no cookies, no accounts, no tracking. It also detects randomized and virtualized addresses, displays ownership history of prefixes, lists each block of suppliers, and provides free MCP servers for AI assistants.