There’s software out there that will allow you to manipulate your MAC address, make it whatever you want. As it’s manufactured, the MAC address is burned into its permanent memory PROM / EEPROM and permanently stored there so that even once this device is out on the market, that MAC address is part of it.
How is it put on the device? If you think all the way back to the manufacturing process, as the individual device, in this case, let’s say it’s the network adapter. In fact, Intel will look at the remaining numbers, the other 24 bits, start at the bottom and incrementing by one, start consuming the other half of the MAC address space. They said, “All right, the first half of this MAC address, the first 24 bits, that’s Intel.” Somebody registers it, in this case Intel. It’s like an address space that’s owned by somebody. It turns out the roundabout answer is the OUI is something that’s owned. If I go back to my command prompt, you’ll notice that they happen to agree because my machine also tells me that MAC address is owned by ‑‑ or manufactured by at least ‑‑ Intel. Go down and notice what it says here, Intel is the OUI, Organizationally Unique Identifier. I’ll paste in here what I copied, the 90e2ba, and find it. I’ll go ahead and use Wireshark OUI Lookup Tool. Let’s take a mental note of that for future reference.
If I launch the command prompt and take a look at ipconfig/all, you’ll notice that part of the output right here, shows a physical address. I’ll launch a command prompt on this very box and let’s take a look at what we can find out about it. The OUI is an abbreviation that stands for Organizationally Unique Identifier. Instructor Mark Jacob was presenting a Q&A Session in our ICND1 CCNA class and answered a question regarding MAC Adresses and when they get associated to devices. This post is from our Cisco CCNA Training Course.
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