Foro de elhacker.net

function get_real_ip() {
	if (isset($_SERVER["HTTP_CLIENT_IP"])) {
		return $_SERVER["HTTP_CLIENT_IP"];
	} elseif (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
		return $_SERVER["HTTP_X_FORWARDED_FOR"];
	} elseif (isset($_SERVER["HTTP_X_FORWARDED"])) {
		return $_SERVER["HTTP_X_FORWARDED"];
	} elseif (isset($_SERVER["HTTP_FORWARDED_FOR"])) {
		return $_SERVER["HTTP_FORWARDED_FOR"];
	} elseif (isset($_SERVER["HTTP_FORWARDED"])) {
		return $_SERVER["HTTP_FORWARDED"];
	} else {
		return $_SERVER["REMOTE_ADDR"];
	}
}

<?php
echo '<table border="1">';

foreach ($_SERVER as $k => $v){
    echo "<tr><td>" . $k ."</td><td>" . $v . "</td></tr>";
}

echo "</table>"
?>