<html>
<head>
<title>-cSc Port Scaner-</title>
<style type="text/css">
b {color: green}
p {color: white}
h4 {color: red}
</style>
</head>
<body bgcolor = "#010101">
<center>
</br></br></br></br>
<img src="http://www.csc-n3tw0rk.org/portscan/header.jpg"><br>
<form name="input" action="" method="post">
<p>TARGET IP:</p>
<input type="text" name="ip" size="15" maxlength="30" value = "www.google.com"></br>
<p>PORT TO SCAN:</p>
<input type="text" name="port" size="15" maxlength="15" value = "80"></br></br>
<input type="submit" value="Start Scaning"></br></br>
<?php
set_time_limit(0);
$ip = $_POST['ip'];
$port = $_POST['port'];
$connection = @fsockopen($ip, $port);
if ($connection) {
echo "<b>Port $port on $ip is open.</b>";
fclose($connection);
} else {
echo "<h4>Port $port on $ip is not open.</h4>";
}
?>
</center>
</body>
he encontrado este simple escaner de puertos en php .. ideal para cuando tenemos algun servidor donde correrlo.se puede mejorar.