What are the potential reasons for the displayed IP address being ::1 or an IPv6 address?

The displayed IP address being ::1 or an IPv6 address could be due to the server running on localhost or the client accessing the server through an IPv6 connection. To solve this issue, you can check if the IP address is ::1 and replace it with the standard IPv4 localhost address (127.0.0.1) in your PHP code. 

// Get the client's IP address
$ip = $_SERVER['REMOTE_ADDR'];

// Check if the IP address is ::1
if ($ip == '::1') {
    $ip = '127.0.0.1'; // Replace ::1 with IPv4 localhost address
}

echo $ip; // Display the corrected IP address

Keywords

IPv6 IP address ::1 localhost network configuration

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