How Can I Retrieve Client IP and MAC Addresses in PHP?

PHP: Retrieving Client MAC and IP Address

Getting Server Information

You can retrieve the server's IP address from $_SERVER['SERVER_ADDR']. To obtain its MAC address, parse the output of netstat -ie (Linux) or ipconfig /all (Windows).

Obtaining Client Data

The client's IP address is readily available in $_SERVER['REMOTE_ADDR']. However, accessing the MAC address presents a challenge.

Client MAC Address (LAN Only)

If the client and server reside on the same Ethernet segment, you can determine the client's MAC address by parsing the output of arp -n (Linux) or arp -a (Windows).

<?php
$ipAddress = $_SERVER['REMOTE_ADDR'];
$macAddr = false;

$arp = `arp -a $ipAddress`;
$lines = explode("\n", $arp);

foreach ($lines as $line) {
    $cols = preg_split('/\s+/', trim($line));
    if ($cols[0] == $ipAddress) {
        $macAddr = $cols[1];
    }
}
?>

No LAN? No Access to MAC Address

Unfortunately, retrieving the client's MAC address is not feasible if it's located outside the local network, unless the client explicitly provides the information through other means.

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