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This question already has an answer here:

At my school they are requesting my MAC address so that I can use the schools Wi-Fi. Now I understand that the school can see what sites I am going to while I'm at school. But can the school see what I am searching when I am at home (using a different network)?

merged by Rory Alsop Oct 25 '14 at 14:26

This question was merged with What can my university see if they have my MAC address? because it is an exact duplicate of that question.

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