Need program to scan MAC

[core2extreme]

thanks but it's not what I meant I'm looking for a program that scans the correct mac adress to a modem go operational. i have 4 valid macs with 4mbps, 6, 10 and 16mpbs speed. i like to scan other valid mac with other speed. I go step by step like change mac latest numbers. some mac work some not ..
XX:XX:XX:0F:5D:A2 - 4mpbs
XX:XX:XX:0F:5D:A3 -not work...
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XX:XX:XX:0F:5D:80- work..... to bother , so I thought it somewhat easier
I hope you understand me now thanks