Problem with simple for and gethostbyaddr Plz Help

Hellow,
I've writen a simple php script that scans an ip range and returns the hosts but the problem is that it just stops returning results for no obvius reason to me.. I really cant figure whats wrong.. Im not realy experienced in PHP so plz, could anyone help me with this?

<?php

$startofrange='62.112.192.1';
$endofrange='62.112.192.50';

$ipstart=ip2long($startofrange);
$ipend=ip2long($endofrange);

for( $ip=$ipstart ; $ip<=$ipend ; $ip++ )
{
echo long2ip($ip)."=";
echo $ip."=";
$hostname = gethostbyaddr($ip);
echo $hostname."<br>";
}

?>

PHP:

Any ideas? what am i doing wrong?

 

change

$hostname = gethostbyaddr($ip);

PHP:

to

$hostname = gethostbyaddr(long2ip($ip));

PHP:

script ran fine on my end. if it still doesnt work for you,
it might be PHP settings on your server.

 

I tried that but it didnt work,

then i checked the settings and max_execution_time was set to 30sec so the code couldnt complete in such sort time. I changed it to half an hour an it worked fine

Thank you for your help!

 

<?php
/** Set a sensible line break, coz it makes sense **/
$break = php_sapi_name() == "cli" ? "\r\n" : "<br />\n";
/** Make a function out of it **/
function scan_range( $start, $finish, $print = true )
{
	/** Need line breaks **/
	global $break;
	/** Always begin at the beginning **/
	$data["start"] = ip2long( $start ) ;
	/** Try to finish at the end **/
	$data["finish"] = ip2long( $finish ) ;
	do /** START DOOOING **/
	{	
		$ip = long2ip( $data["start"] );
		$data["results"][$ip]["long"] = @ip2long( $ip );
		$data["results"][$ip]["host"] = @gethostbyaddr( $ip );
		/** ONLY OUTPUT IF $PRINT == TRUE **/
		if( $print ):
			printf("IP : %s %s",  $ip, $break );
			printf("Long : %s %s",  $data["results"][$ip]["long"], $break );
			printf("Host : %s %s",  $data["results"][$ip]["host"], $break );
		endif;
		/** CONTINUE DOING **/
		$data["start"]++;		
	}
	/** WHILE THIS STATEMENT IS TRUE **/
	while( $data["start"] <= $data["finish"] );
	/** PUT THINGS BACK THE WAY WE FOUND IT **/
	$data["start"] = $start;
	$data["finish"] = $finish;
	/** RETURN THE ARRAY OF DATA **/
	return $data ;	
}
// will print formatted data
scan_range('62.112.192.1', '62.112.192.10' );
// will store results in $array without printing
$array = scan_range('62.112.192.1', '62.112.192.10', false );
// looping over that array
foreach( $array["results"] as $key => $data )
{
	echo "IP : $key $break";
	echo "Long : $data[long] $break";
	echo "Host : $data[host] $break";
}
echo "<*RAW*> $break";
print_r( $array );
echo "<*RAW*> $break";
?>

PHP:

That was fun .....

 

Nice code krackjoe thanx very much,
it seem a bit complex to me but it will do me good to figure it out and learn
from it, as i said before im not realy expirienced in php

As i've been working with gethostbyaddr i noticed that when there are dead hosts in the scanned range it takes really long to return results to the browser,
about 3 secs per dead host, so when i tryied to scan a range of about 500 ips it
took a bit longer than half an hour!!

is there any way to make the gethostbyaddr go faster? or at least not delay that much on every dead host. should i forget gethostbyaddr and try something else?