All MAC addresses are hard-coded into a network card and can never be changed. However, you can change or spoof the MAC address in the operating system itself using a few simple tricks. For example, a WiFi network may allow only authorized computers to connect to the network and filters out computers based on the MAC address. Another example is if you have an ISP that allows only a certain number of computers to connect to the Internet from your home. You can change the MAC address for the network card in Windows pretty easily following the steps below. Step 1: Click on Start, then Control Panel, then Network Connections, and right-click on the network connection you want to change the MAC address for and select Properties. If you are using Windows Vista, Windows 7 or higher, you have to go to Control Panel, then Network and Internet, then Network and Sharing Center, and then click on Manage Network Connections or Change adapter settings. Step 3: Now click on the Advanced tab and click on the Locally Administered Address property or the Network Address property. Secondly, you need to manually figure out the technical name of the adapter before you can change the settings. Now you can simply compare the MAC addresses listed here with the one you saw via System Preferences.
Before we change the MAC address, you can use a useful command in Terminal to generate a random MAC address if you need one.
Now that you have a new MAC address, you can change the current one using the following command below.

In order to do this, you need to be logged in as an Administrator or you have to enable the root account in OS X.
So here is a rundown of all the commands I ran in order to get the current MAC address, generate a random one, update the MAC address and then verify to make sure it had actually changed. As I mentioned earlier, this is definitely not as straightforward as the process is on Windows, but you should be able to do it if you simply copy and paste the commands above. About Online Tech TipsWelcome to Online Tech Tips – A blog that provide readers with daily computer tutorials, technology news, software reviews, and personal computing tips. In today’s networks, ARP, or Address Resolution Protocol converts a MAC address to a Layer 3 protocol address, such as an IP address. Well there are many reasons for this, mostly related to bypassing some kind of MAC address filter set on a modem, router or firewall. If you can sniff out a legitimate MAC address, you can then spoof your MAC address and gain access to the WiFi network. If you have more computers that need to connect, you can spoof the MAC address of an authorized computer and connect from a different computer. You can also do so via the registry, but it’s much more technical and probably not required by most people. Firstly, you have to use Terminal (similar to command prompt in Windows) to actually change the MAC address. I thought you could simply choose Manually from the Configure dropdown, but that doesn’t allow you to edit the MAC address.

Depending on how many interfaces you have on your computer, you might need to run this command several times adding 1 to the number each time.
The MAC Address is a six-byte number or 12-digit hexadecimal number that is used to uniquely identify a host on a network. Changing the MAC Address can help you bypass certain network restrictions by emulating an unrestricted MAC Address or by spoofing a MAC address that is already authorized. For example, I ran the following commands below until I reached an interface that didn’t exist. I graduated from Emory University in Atlanta, GA in 2002 with a degree in Computer Science and Mathematics. Make sure to select the appropriate interface first (WiFi, Ethernet, etc) in the listbox on the left. You have to press and hold the Option key and then click on the WiFi icon to see the disconnect option.

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