MAC Address Lookup
Find the manufacturer (OUI vendor) for any MAC address. Enter a MAC to see vendor, country, registry block, and locally-administered / multicast flags.
About this tool
MAC Address Lookup identifies the manufacturer registered to a MAC address's OUI (the first three octets). Type any MAC in :, -, . or no-separator form and the tool returns the vendor name, registered address, country, the IEEE registry block it belongs to, and when the record was last updated.
Example: 00:1B:44:11:22:33 → Vendor: SanDisk Corporation, Country: US, Block: 001B44 (MA-L). An unrecognised prefix such as a virtual machine's 08:00:27 still resolves to its vendor (Oracle / VirtualBox) because that OUI is registered.
Beyond the vendor, the tool decodes the first octet to tell you whether the address is globally unique or locally administered (the U/L bit), and whether it is unicast or multicast (the I/G bit). Useful when debugging DHCP logs, tracing rogue devices on a LAN, or telling a real NIC apart from a VM, Docker container, or randomised phone MAC.
FAQ
What formats does the input accept? ›
Any MAC with 6 to 12 hexadecimal digits, separated by colons, dashes, dots, spaces, or nothing at all. Examples: 00:1B:44:11:22:33, 00-1B-44-11-22-33, 001B44112233, and even just the OUI 00:1B:44 will look up the vendor.
Why does my device show "Locally administered" instead of a vendor? ›
When the U/L bit (the second-least-significant bit of the first octet) is set, the address was assigned locally rather than burned into the NIC by the manufacturer. Modern phones use these randomised addresses for privacy, as do Docker and many VM hypervisors, so there is no fixed vendor to look up.
Why does a real device show "No vendor registered"? ›
The IEEE database only assigns OUI blocks to organisations that pay for one. Smaller vendors, custom hardware, or unregistered ranges will have no match. The address-type card still tells you whether it is unicast/multicast and locally/globally administered.
Where does the vendor data come from? ›
The vendor and registry-block fields are resolved against the public IEEE OUI assignment database. The address-type flags (U/L and I/G bits) are computed locally from the first octet and work even if the network lookup fails.