Networking: How to Change or Spoof MAC Address in Windows XP, Vista, by Britec
MAC address (Media Access Control address) is a quasi-unique identifier consists of a six byte number that attached to most network adapter card or network interface card (NIC). As such, all network cards, whether its of Ethernet NIC, Gigabit Ethernet NIC or wireless 802.11a/b/g/n WiFi or HiperLAN adapter, should have different MAC addresses, which also known as Ethernet Hardware Address (EHA) or adapter address.
In operating system, MAC address is often represented in 12-digit hexadecimal number. For example, 00-16-E6-4D-5E-0A.
free Mac Spoofing Software
https://www.technitium.com/tmac/index.html
Not Freeware
https://www.klcconsulting.net/smac/
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