Look up the manufacturer of any network device by its MAC address. Our tool uses the official IEEE OUI (Organizationally Unique Identifier) database to identify the vendor behind any MAC address prefix.
Enter a full MAC address like D8:A3:5C:12:34:56 or just the OUI prefix D8:A3:5C to find the manufacturer.
What is a MAC Address?
A MAC (Media Access Control) address is a unique hardware identifier assigned to every network interface. It is a 48-bit address typically written as six pairs of hexadecimal digits separated by colons or hyphens, such as D8:A3:5C:12:34:56. The first three octets (D8:A3:5C) form the OUI, which identifies the manufacturer, while the last three octets are assigned by the manufacturer to each individual device.
FAQ
What is an OUI?
An OUI (Organizationally Unique Identifier) is the first 24 bits (3 bytes) of a MAC address, assigned by IEEE to hardware manufacturers. It uniquely identifies the company that made the network interface. For example,
D8:A3:5C is assigned to Samsung Electronics.How do I find my MAC address?
On Windows: open Command Prompt and run
ipconfig /all - look for "Physical Address". On macOS: go to System Settings > Network > select interface > Details, or run ifconfig in Terminal. On Linux: run ip link or ifconfig in terminal. On iOS: Settings > General > About > Wi-Fi Address. On Android: Settings > About Phone > Status > Wi-Fi MAC Address.What are the different IEEE registry types?
IEEE offers three registry sizes: MA-L (MAC Address Block Large) assigns a 24-bit OUI giving 16 million addresses per vendor. MA-M (Medium) assigns a 28-bit block giving 1 million addresses. MA-S (Small) assigns a 36-bit block giving 4,096 addresses. Most major manufacturers use MA-L.
Why does my device show a different MAC address on different networks?
Modern operating systems use MAC address randomization for privacy. iOS, Android, Windows, and macOS generate random MAC addresses for each Wi-Fi network to prevent tracking. The randomized address will not match any vendor in the OUI database. Your device's actual hardware MAC can still be found in system settings.
Can a MAC address be changed?
Yes, MAC addresses can be changed in software (called "spoofing"). While the hardware MAC is burned into the network interface, operating systems allow overriding it. This is used legitimately for privacy and network configuration, and is also why MAC addresses alone should not be used for security authentication.
How many OUI entries exist?
The IEEE OUI database contains approximately 30,000 entries from manufacturers worldwide, updated regularly as new assignments are made. This covers everything from major brands like Apple, Samsung, and Intel to specialized industrial equipment manufacturers.