The MAC address, by TCP/IP standards, is never communicated outside of the local-area network to which it pertains -- routers beyond that LAN don't even get the information you're trying to record. There are many other ways to try and identify unique visitors, including matching the user-agent's details in addition to the IP, serving cookies as part of your response, &c: it is, after all, a core functionality in the field of "web analytics". MAC addresses are simply not part of the gamut of techniques that it makes sense to utilize for it!-)
https://stackoverflow.com/questions/3454858/how-to-get-client-mac-address-by-a-access-on-a-website
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