long2ip

(PHP 4, PHP 5)

long2ip --  Converts an (IPv4) Internet network address into a string in Internet standard dotted format

Description

string long2ip ( int proper_address )

The function long2ip() generates an Internet address in dotted format (i.e.: aaa.bbb.ccc.ddd) from the proper address representation.

See also: ip2long()


add a note add a note User Contributed Notes
Gabriel Malca
17-Mar-2006 09:01
If the function doesn't exist:

<?
  
if (!function_exists("long2ip")) {
       function
long2ip($long) {
          
// Valid range: 0.0.0.0 -> 255.255.255.255
          
if ($long < 0 || $long > 4294967295) return false;
          
$ip = "";
           for (
$i=3;$i>=0;$i--) {
              
$ip .= (int)($long / pow(256,$i));
              
$long -= (int)($long / pow(256,$i))*pow(256,$i);
               if (
$i>0) $ip .= ".";
           }
           return
$ip;
       }
   }
?>
randomize at randomizer dot com
28-Jan-2006 01:51
Random ip address! (4294967295 is 255.255.255.255)

long2ip(rand(0, "4294967295"))
flobee
14-Feb-2005 06:50
when importing ip-ranges to a mysql database using an INT(10) field - NOTE: that you will get problems when using intval() function!

copied from "cleong" : 02-Oct-2001 02:21
intval() handles overflow differently depending on the type of the argument.
<?php
// intval('10000000000') = 2147483647
// intval(1e10) = 1410065408
?>
Tom Crosley
17-Feb-2003 05:13
I wanted to be able to pass an IP address in a URL always as an unsigned int.  I then converted it back as shown below:

$ip_addr = "192.168.100.25";  // example IP address that converts to neg #

$s32int = ip2long($ip_addr);

$us32str = sprintf("%u",$s32int);              // convert to unsigned string

// display orig IP address, signed 32 bit version, unsigned 32 bit ver,
// finally converted back to IP addr

printf("%s ,%d, %s, %s", $ip_addr, $s32int, $us32str,
         long2ip(-(4294967296-$us32str)));

// tested on Linux/Apache PHP 4.1.2