echo '<pre>',print_r($var, 1);die;

#EXTM3U
#EXTINF:0,Россия 24
http://176.51.20.15:1234/udp/233.7.70.68:5000
#EXTINF:0,ОРТ
....

<?php
error_reporting(0);

$from = $_POST['ip1'];
$to = $_POST['ip2'];
$port1=$_POST['port1'];
$port2=$_POST['port2'];
$myFile = "ip_up.txt";
$fh = fopen($myFile, 'w');
$arry1 = explode(".",$from);
$arry2 = explode(".",$to);
$a1 = $arry1[0]; $b1 = $arry1[1]; $c1 = $arry1[2]; $d1 = $arry1[3];
$a2 = $arry2[0]; $b2 = $arry2[1]; $c2 = $arry2[2]; $d2 = $arry2[3];
while( $d2 >= $d1 || $c2 > $c1 || $b2 > $b1 || $a2 > $a1){
if($d1 > 255){
$d1 = 1;
$c1 ++;
}
if($c1 > 255){
$c1 = 1;
$b1 ++;
}
if($b1 > 255){
$b1 = 1;
$a1 ++;
}
$ip = "$a1.$b1.$c1.$d1";
for($i=$port1;$i<(int)$port2+1;$i++) {
$tB = microtime(true);
$fP = fSockOpen($ip, $i, $errno, $errstr, 0.2);
$tA = microtime(true);
 if (!$fP)
// {echo $ip.":".$i;}

 else {

echo $ip. ":" .$i. " -- OK, " . round((($tA - $tB) * 1000), 0). " ms.";

fwrite($fh, $ip."\r\n");
fclose($fh);
 }
echo "<br>";
flush();
}
$d1 ++;
}
echo '<a href="ip_up.txt">Download</a>';

?>