Note: The MAC Address Lookup provides you with information on the OUIs that are registered and assigned by IEEE. The tool finds the MAC address from the MAC Address Vendor Database and displays the manufacturer originally manufactured this device.To perform the MAC Address Vendor Lookup, perform the following steps All this information is helpful if you want to verify the generated mac address with the original vendor of this device in the OUI vendor database. Moreover, it tells us what country this device was manufactured in. The MAC Vendor Lookup finds the MAC Address from this database and tells us which manufacturer originally manufactured this device and what is the prefix and postfix of a given MAC Address. How to perform the MAC Address Vendor Lookup? The MAC Address Vendor Database consists of a list of mac addresses of all devices manufactured to date. This means that 2 24 (= 16.777.216) unique OUAs can be assigned per OUI.MAC Address Lookup Tool searches your MAC Address or OUI in the MAC Address Vendor Database. Bit 25-48 (network adapter identifier): Bits 25 to 48 provide device manufacturers with 24 bits for assigning a unique hardware identifier (organizationally unique address, OUA).A corresponding service is available, for example, on. The assignment of OUIs is usually public and can be determined via databases. Bit 3–24 (manufacturer identification): Bits 3 to 24 encode an identifier (organizationally unique identifier, OUI), which is assigned exclusively to hardware manufacturers by IEEE.Addresses that are only locally unique are called locally administered address (LAA) and are marked with U/L = 1. If U/L = 0, the address is valid worldwide as a universally administered address (UAA). Bit 2 (registry): The second bit of the MAC address indicates whether it is an address with global validity (universal) or whether the address has been assigned locally (local).Multicast addresses are identified by I/G = 1 and are addressed to several receivers. If I/G = 0, it is a unicast address for a single network adapter. This bit is called I/G (short for individual/group). Bit 1 (receiver): The first bit of the MAC address specifies whether it is an individual or group address.The bit sequence of each MAC address is divided into 4 areas, each of which encodes different information.

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