YouCanHackEven

Mac address is actually unique 12 digit hexa decimal number assigned to the every ethernet card during manufacturing. It is very simple to change your computer's MAC address by doing slight modifications in your windows registry editor or either by using ready made softwares.
One of those softwares is Etherchange ( download it ). But Eterchange will not run on the windows vista and Windows 7 onwards. Etherchange software can be used in windows XP, NT and 2000. But in Windows vista and Windows 7 you can change the MAC address manually through registry editor. It involves the following steps.

so the process of changing your MAC address through the windows registry editor is as follows.
1. Go to windows registry by typing regedit in your run command.
2. Now go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972- E325-11CE-BFC1-08002BE10318}

3. Now double-click {4D36E972- E325-11CE-BFC1-08002BE10318}.

4.  List will be opened which looks like 001,002,003...................,0016.
5. Now you chould manually check all the keys ie 001,002,003...................,0016 for where your ethernet card is present. You should check the the right side pane for your ehernet card(ethernet card is actually the your ethernet card manufacturer name).

6. You will found your ethernet card in one of the keys (001,002,003...................,0016), now in the right side pane right click your mouse and select new string value. Then enter the name for that string value as NetworkAddress. Observe that in the NetworkAddress N and A are capitals.
7. After giving the name to the string value double click the NetworkAddress.
8. Now in the value data field enter the new MAC address for your computer.


9.Now either disable your network adopter and enable it  OR simply restart your computer.
10. Now the work is done. Your MAC address is changed.
              Thats it guys. Now just play around with all the IP addresses in your Local LAN.....!!!! : )