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Last updated: Sat, 27 Jan 2007

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# inet_ntop

(PHP 5 >= 5.1.0RC1)

inet_ntop -- Converts a packed internet address to a human readable representation

## Description

string inet_ntop ( string in_addr )

This function converts a 32bit IPv4, or 128bit IPv6 address (if PHP was built with IPv6 support enabled) into an address family appropriate string representation. Returns `FALSE` on failure.

Пример 1. inet_ntop() Example

`<?php
$packed = chr(127) . chr(0) . chr(0) . chr(1);
$expanded = inet_ntop($packed);
/* Outputs: 127.0.0.1 */
echo $expanded;
$packed = str_repeat(chr(0), 15) . chr(1);
$expanded = inet_ntop($packed);
/* Outputs: ::1 */
echo $expanded;
?>`

> Замечание: Для Windows-платформ эта функция не реализована.

See also long2ip(), inet_pton(), and ip2long().

add a note User Contributed Notes
inet_ntop
MagicalTux at FF dot st
04-May-2005 04:43
`For people who need this function but don't have it, I could write a function which should give almost the same result.
<?php
function my_inet_ntop($ip) {
if (strlen($ip)==4) {
// ipv4
list(,$ip)=unpack('N',$ip);
$ip=long2ip($ip);
} elseif(strlen($ip)==16) {
// ipv6
$ip=bin2hex($ip);
$ip=substr(chunk_split($ip,4,':'),0,-1);
$ip=explode(':',$ip);
$res='';
foreach($ip as $seg) {
while($seg{0}=='0') $seg=substr($seg,1);
if ($seg!='') {
$res.=($res==''?'':':').$seg;
} else {
if (strpos($res,'::')===false) {
if (substr($res,-1)==':') continue;
$res.=':';
continue;
}
$res.=($res==''?'':':').'0';
}
}
$ip=$res;
}
return $ip;
}
?>
I followed IPv6 reprenstation rules :
- A series of "0"s in a 16bit block can by represented by "0".
- A series of blocks containing only "0"s can be suppressed and represented by "::" (this can be done only once)
(source : http://www.ipv6style.jp/en/faq/latest.shtml#2003022112 )
Example:
<?php
$packed = str_repeat(chr(0), 15) . chr(1);
$expanded = my_inet_ntop($packed);
/* Outputs: ::1 */
echo $expanded;
?>
I checked in CVS (2005-04-25) and didn't find the inet_ntop function (I really needed to handle IPv6) so I implemented it myself !`
mirko dot steiner at slashdevslashnull dot de
23-Mar-2005 11:08
`i've used this nice one oneline code:
<?PHP
$one = 192;
$two = 168;
$three = 1;
$four = 1;
$ip = $one*pow(256,3) + $two*pow(256,2) + $three*pow(256,1) + $four*pow(256,0);
echo $ip;
?>
you can also put the first one, shift them by 24 bits to the right, take the secod and shift them by 16, the 3rd by 8 and put thouse all together bitwise...`
add a note
inet_pton headers_sent

Last updated: Sat, 27 Jan 2007
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