Win 7 Weird MAC addresses

March 7, 2013 at 04:47:16
Specs: Windows 7
A friend had me rebuilt an old compaq for him and for some reason all the MAC addresses of any ethernet cards, WAN miniports, etc all have weird MACs. They all have format 00:00:00:00:00:nn where nn is a two digit hex value. I thought it was a problem with the onboard LAN but I disabled it and installed another LAN card in a spare PCI slot but still get the same thing. Why is it doing this?

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March 7, 2013 at 04:54:43
Maybe this will explain

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March 7, 2013 at 05:11:25
Not really. Can you explain, maybe?

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March 7, 2013 at 05:31:58
My bad. I thought you were referring to the IPV6 Ip addressing. Mac address are supposed to be in a six block hex dec format. The mac address that are all zeros and end with a hex dec are virtual devices.

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March 7, 2013 at 09:18:50
Post the results of a ipconfig /all so we can see what you are seeing.

Typically the actual card will show the physical address and tunnel adapters dealing with ipv6 have the 00 format.

This is normal.

Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's

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March 7, 2013 at 14:12:53
Here is a link to a screenshot of the ipconfig settings:

The very first one is a physical card that I installed. I've disabled the on board LAN for now but it was doing the same thing. And just fyi, my network does not utilize IPV6 so I should have an ip with format 131.151.141.NNN. Now, when this screenshot was taken I didn't have a cable connected to the card but that doesn't matter because when the cable is attached it's the same deal.

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