Search OUI Prefixes by Manufacturer
If you are building network monitoring tools or configuring enterprise firewalls, you often need to whitelist or identify all devices from a specific manufacturer. Our MAC Address Vendor Search acts as a reverse-lookup, allowing you to search for a company name and retrieve all MAC prefixes assigned to them.
Essential for Network Admins
Massive companies do not just have one OUI. Because each prefix only supports 16 million unique devices, major manufacturers own hundreds of prefixes:
- Apple Inc: Owns hundreds of prefixes for iPhones, Macs, and Apple Watches.
- Cisco Systems: Holds massive blocks of OUIs for their global enterprise networking hardware.
- Use this tool to generate comprehensive whitelists or logic rules for your network security appliances by downloading the full list of a vendor's prefixes.
How to Use This Tool
- Upload or Input Data: Select your file or paste your data directly into the tool interface. Everything remains on your device.
- Configure & Process: Adjust any optional settings if necessary. The tool will process your data instantly inside your browser.
- Download Result: Preview the output and click the download or copy button to save your final results.
Frequently Asked Questions
Where does this data come from?
The data is sourced directly from the official IEEE (Institute of Electrical and Electronics Engineers) registry, which is the global authority that assigns these blocks.
Are virtual machines (VMs) listed here?
Yes, virtualization software companies like VMware and VirtualBox have their own registered OUIs for assigning MAC addresses to virtual network adapters.
Is the database up to date?
Yes, we regularly sync our internal OUI database with the IEEE public registry to ensure newly assigned prefixes are discoverable.