unique identification of system

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.

By using the PHP it can be achieved

Refer the following link: https://stackoverflow.com/questions/1634782/what-is-the-most-accurate-way-to-retrieve-a-users-correct-ip-address-in-php?rq=1

i think that might be useful is there any mistake please notify me...

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Manikandan Murugesan9y ago
            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.
By using the PHP it can be achieved
   Refer the following link: https://stackoverflow.com/questions/1634782/what-is-the-most-accurate-way-to-retrieve-a-users-correct-ip-address-in-php?rq=1

    i think that might be useful is there any mistake please notify me...