interger to I P address

bfeeny at mac.com bfeeny at mac.com
Wed Aug 27 11:47:13 CDT 2008


The NANOG way: www.google.com


------Original Message------
From: Boyd, Benjamin R
To: Andree Toonk
To: nanog at nanog.org
Sent: Aug 27, 2008 12:38 PM
Subject: RE: interger to I P address

>>> The harder way:
>>>
>>> Decimal: 1089055123
>>> Hex (dashes inserted at octals): 40-E9-A9-93 Decimal (of 
>each octet): 
>>> 64-233-169-147 IP Address: 64.233.169.147
>>
>> The Python way
>>
>> >>> import socket, struct
>> >>> socket.inet_ntoa(struct.pack('>l', 1089055123))
>> '64.233.169.147'
>
>The Perl way:
>
>sub ntoa
>{
>    my $one = shift;
>    my $four = $one & 0xff;
>    $one >>= 8;
>    my $three = $one & 0xff;
>    $one >>= 8;
>    my $two = $one & 0xff;
>    $one >>= 8;
>    return "$one.$two.$three.$four";
>}
>
>#or in one line, like ipcalc does:
>sub ntoa_in_one_line { join(".", unpack("CCCC", pack("N", $_[0]))); }
>
>print ntoa(1089055123) . "\n";
>print ntoa_in_one_line(1089055123) . "\n";
>
>

The PHP way:
function convertIntegerToIpv4($integer) 
{
  $max_value = pow(2,32);           //4,294,967,296 
  $bug_fix = 0;
  settype($integer, float);

  if($integer > 2147483647) $bug_fix = 16777216;
    
  if(is_numeric($integer)) 
  { 
    if ($integer >= $max_value || $integer < 0)
    {
      return ('Not a valid IPv4 integer');
    }
    $ip = (sprintf("%u.%u.%u.%u",
            $integer / 16777216,
            (($integer % 16777216) + $bug_fix) / 65536,
            (($integer % 65536) + $bug_fix / 256) / 256,
            ($integer % 256) + $bug_fix / 256 / 256
            )
          ); 
    return($ip);
  }
  else {
     return('');
  }
}

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