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Solved! Go to Correct Answer
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While I mostly agree with your other helpers, here is my two cents.
About MAC/Physical/Hardware Addresses:
#1 They are always sent in the clear, regardless of encryption (think SSL or even WPA2).
#2 It is possible to spoof/clone them.
For a Linksys BEFSR41W, after logging into the NAT router you would click on Advanced and then click on MAC Address Clone
See the UI at https://ui.linksys.com/BEFSR41W/wanMac.htm
While I have no comments as how to spoof/clone the MAC Address on a normal computer (not a NAT router): So keeping in mind it is possible to spoof/clone them I have an idea.
#1 Change the password for the Wi-Fi link.
#2 Add one computer at a time that is/are authorized to use the Wi-Fi link. Ex If I had an iPhone, I would update the iPhone to what the new password is.
#3 As you add one computer at time (update what the password is), you should be able to figure it out.
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Try googling the MAC address.
It will tell you the device manfacturer.
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Answering for anyone that finds this post when asking google the same question.
IEEE REGISTRATION AUTHORITY is the official organization that issues the MAC addresses.
Companies sometimes buy a subset of a MAC address block, they share the same first 6 character of the MAC address with other purchasers. Therefore, when you look up the MAC address by the first 6 character, it shows “IEEE REGISTRATION AUTHORITY”.
Think of it as an apartment building. They bought one apartment in the building. If you look up the building address (without apartment number) , you get the building name. You have to look up the secondary information ( apartment number ) to see them.
Probably a security camera or something.
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While I mostly agree with your other helpers, here is my two cents.
About MAC/Physical/Hardware Addresses:
#1 They are always sent in the clear, regardless of encryption (think SSL or even WPA2).
#2 It is possible to spoof/clone them.
For a Linksys BEFSR41W, after logging into the NAT router you would click on Advanced and then click on MAC Address Clone
See the UI at https://ui.linksys.com/BEFSR41W/wanMac.htm
While I have no comments as how to spoof/clone the MAC Address on a normal computer (not a NAT router): So keeping in mind it is possible to spoof/clone them I have an idea.
#1 Change the password for the Wi-Fi link.
#2 Add one computer at a time that is/are authorized to use the Wi-Fi link. Ex If I had an iPhone, I would update the iPhone to what the new password is.
#3 As you add one computer at time (update what the password is), you should be able to figure it out.