Look up MAC address vendor (OUI) information. Generate random MAC addresses with optional vendor prefix.
The organizational prefix at the front of a MAC address is the key this page uses. Paste an address to find the company or organization associated with its registered OUI, or generate a random address while optionally retaining a selected vendor prefix. It answers "who received this address block?" rather than "what is this exact device?" A match does not reveal the device model, current owner, location, or trustworthiness. Addresses can also be locally administered, virtualized, or spoofed. Processing stays in the browser, so the queried address is not uploaded.
On lookup, the tool compares the vendor-identifying prefix of the entered MAC address with its OUI assignment data. A matching entry names the organization to which that prefix was registered and presents the available vendor information. The remaining suffix distinguishes interface addresses within the allocation; it does not turn the registry match into proof about a particular device, product line, or network operator.
When a vendor prefix is selected, the generator keeps that organizational portion and randomizes the remaining address digits. Leaving the vendor unrestricted produces a random MAC address without claiming a selected organizational identity. Generated values work as test inputs, but randomness alone neither reserves an address nor checks whether another interface already uses the same value.
The registry names the holder of the address block. That holder may supply components, manufacture equipment for another brand, operate a virtualization platform, or allocate addresses through a subsidiary. The device may also be using a changed or spoofed address. Treat the returned name as prefix provenance, not as definitive product identification.
No, not automatically. A randomly generated value can collide with an address already in use and may carry a prefix registered to someone else. Before configuring it on production equipment, follow the platform and network address-assignment requirements and verify uniqueness wherever the address will be visible. Generation creates test data; it does not reserve the value.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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