(PHP 5 >= 5.1.0)

inet_ntopConverts a packed internet address to a human readable representation


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.

Elenco dei parametri


A 32bit IPv4, or 128bit IPv6 address.

Valori restituiti

Returns a string representation of the address o FALSE in caso di fallimento.


Example #1 inet_ntop() Example

chr(127) . chr(0) . chr(0) . chr(1);
$expanded inet_ntop($packed);

/* Outputs: */
echo $expanded;

$packed str_repeat(chr(0), 15) . chr(1);
$expanded inet_ntop($packed);

/* Outputs: ::1 */
echo $expanded;

Log delle modifiche

Versione Descrizione
5.3.0 This function is now available on Windows platforms.

Vedere anche:

  • long2ip() - Converte un indirizzo di rete del Protocollo Internet (IPv4) in una stringa contenente un indirizzo espresso secondo la notazione standard di Internet.
  • ip2long() - Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address. Converte una stringa contenente un indirizzo di rete del Protocollo Internet (IPv4) in un indirizzo espresso come tipo di dato int.
  • inet_pton() - Converts a human readable IP address to its packed in_addr representation

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User Contributed Notes 3 notes

ryansun81 at gmail dot com
4 years ago
For people who wondering what the meaning of this function name:
pton: a presentation(printable) format address to network address
ntop: a network address to presentation(printable) format address
PandoraBox2007 at gmail dot com
3 years ago
Before inet_pton nice work


no need compare compress data
string inet_ntop ( string $in_addr [, bool $compress = false] )

MagicalTux at FF dot st
9 years ago
For people who need this function but don't have it, I could write a function which should give almost the same result.

function my_inet_ntop($ip) {
    if (
strlen($ip)==4) {
// ipv4
    } elseif(
strlen($ip)==16) {
// ipv6
$ip as $seg) {
$seg{0}=='0') $seg=substr($seg,1);
            if (
$seg!='') {
            } else {
                if (
strpos($res,'::')===false) {
                    if (
substr($res,-1)==':') continue;

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 : )

= 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 !
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