MACVendors.com

Enter the address from a device inventory to retrieve its registered vendor, or use the provider’s HTTP GET/POST interface for a script. MACVendors says its registry data comes directly from IEEE and refreshes several times a day. Up to 1,000 requests per day need no registration or API key; higher-volume use has paid plans, and excessive requests can return 429 rate-limit responses. Use the match as registration context. It does not identify the exact device model, current owner or physical location, and an address that does not reflect its manufacturer’s registered block may not yield the expected vendor.