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

Client MAC and IP Address Retrieval in PHP

Acquiring the MAC and IP addresses of connected clients in PHP warrants attention as it may be pivotal for system monitoring or security purposes. To delve into this challenge, let's dissect the available options:

Server IP Address

Retrieving the server's IP address is straightforward:

$serverIP = $_SERVER['SERVER_ADDR'];

Server MAC Address

Determining the server's MAC address requires external command parsing:

• For Linux: netstat -ie
• For Windows: ipconfig /all

Client IP Address

Obtaining the client's IP address is also straightforward:

$clientIP = $_SERVER['REMOTE_ADDR'];

Client MAC Address

Retrieving the client's MAC address is more intricate. It's only feasible if the client is on the same Ethernet segment as the server. In this scenario, the following commands can be leveraged:

• Linux: arp -n
• Windows: arp -a

To retrieve the output from external commands, consider employing backticks:

$ipAddress = $_SERVER['REMOTE_ADDR'];
$command = "arp -a $ipAddress";
$arpOutput = backticks($command);

Cross-Network Considerations

If the client is not on the same LAN, retrieving its MAC address is not feasible without voluntary disclosure and alternative transmission channels.

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