The following walkthrough will show you how to temporarily change the MAC address of your ethernet/WiFi device. This is useful for MAC spoofing and network security testing.
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MAC addresses are 48-bit, hexadecimal uids used for organizing a physical network. They're factory-assigned by the creators of the device's network interface card and are typically coded into the device's firmware. They're generated by encoding a manufacturer's registered id number.
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Even if you're using a proxy to mask your machine's IP address, a network administrator can still identify your machine by its unique MAC address.