ip range convert bug after 2147483647

[Oziam]

I have a simple script that converts an ip range to a readable ip address,

 

e.g 2147483647 = 127.255.255.255 and it works fine up to this range,

anything after this causes an incorrect ip address.

 

e.g 2147483648 should be 128.0.0.0 but it outputs 128.0.0.255 and so all ip address after this are incorrect!

 

code I am using is below;

 

$rawip_from = '2147483648';

// raw to readable ip
$w1 = (int)($rawip_from / 16777216) % 256;
$x1 = (int)($rawip_from / 65536   ) % 256;
$y1 = (int)($rawip_from / 256     ) % 256;
$z1 = (int)($rawip_from           ) % 256;

$rawip_to = '2147549184';
// raw to readable ip
$w2 = (int)($rawip_to / 16777216) % 256;
$x2 = (int)($rawip_to / 65536   ) % 256;
$y2 = (int)($rawip_to / 256     ) % 256;
$z2 = (int)($rawip_to           ) % 256;

$ip_from = ($w1.'.'.$x1.'.'.$y1.'.'.$z1);
$ip_to = ($w2.'.'.$x2.'.'.$y2.'.'.$z2);

echo "Ip raw range: $rawip_from - $rawip_to<p>Ip range: $ip_from - $ip_to";

/* should output 
Ip raw range: 2147483648 - 2164260863

Ip range: 128.0.0.0 - 128.1.0.0

but it outputs 128.0.0.255 - 128.1.0.255
*/

It always seems to add 255 to the last range instead of the correct value?????

I heard there is a bug in php with integers > 2147483647

 

if anyone knows of a fix it would be great!!

 

 

Thanks...

[plznty]

That is Int's maximum value, I think you will need a different method to int.

[Oziam]

I worked out a solution, I was playing around and stumbled across it,

I don't know why it works but it does 100% of the time, I have tested it using

all variations of ranges and it outputs the correct value every time!

 

New code!

 

$rawip_from = '3716537112'-0; // adding the -0 or +0 will return a negative value of 221.133.219.-232

// raw to readable ip
$w1 = (int)($rawip_from / 16777216) % 256;
$x1 = (int)($rawip_from / 65536   ) % 256;
$y1 = (int)($rawip_from / 256     ) % 256;
$z1 = (int)($rawip_from           ) % 256;

if($z1 < 0){$z1 = $z1 + 256;} // include this to convert $z1 to the correct value

$rawip_to = '3716537215'-0; // this will return a negative value of 221.133.219.-129
// raw to readable ip
$w2 = (int)($rawip_to / 16777216) % 256;
$x2 = (int)($rawip_to / 65536   ) % 256;
$y2 = (int)($rawip_to / 256     ) % 256;
$z2 = (int)($rawip_to           ) % 256;

if($z2 < 0){$z2 = $z2 + 256;} // include this to convert $z2 to the correct value

$ip_from = ($w1.'.'.$x1.'.'.$y1.'.'.$z1);
$ip_to = ($w2.'.'.$x2.'.'.$y2.'.'.$z2);

echo "Ip range: $ip_from - $ip_to";

// Output: Ip range: 221.133.219.24 - 221.133.219.127 which is correct :-)

 

It would be nice to understand why it works but hey I am just greatful it does!