00- 07- E9- 12- 34- 56 -> Intel How to identify the MAC address of a NIC (network interface controller) The last three octets are usually the universally administered addresses (UAA), assigned by the vendor or manufacturer in nearly any manner they please, however, they should be unique. The first three octets are the organizationally unique identifier (OUI) that uniquely identifies a vendor or manufacturer, e.g. The following is a brief and incomplete summary of the structure of a MAC address. However, it is still possible to change that address in case you need to. Unlike IP addresses, provided by your ISP, router or network admin, the MAC address is assigned by the manufacturer of the network interface controller. A media access control address (MAC address) is a unique identifier assigned to a network interface controller (NIC) for communications at the data link layer of a network segment.
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