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(PHP 5 >= 5.1.0, PHP 7, PHP 8)

inet_ntop Konvertiert eine komprimierte IP-Adresse in ein menschenlesbares Format


inet_ntop(string $ip): string|false

Die Funktion konvertiert eine 32-bittige IPv4- oder eine 128-bittige IPv6-Adresse (sofern PHP mit IPv6-Unterstützung kompiliert wurde) in ein für die Adressfamilie geeignetes Format.



Eine 32-bittige IPv4- or 128-bittige IPv6-Adresse.


Gibt eine Stringdarstellung der Adresse zurück. Bei einem Fehler wird false zurückgegeben.


Beispiel #1 inet_ntop()-Beispiel

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

/* Ausgabe: */
echo $expanded;

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

/* Ausgabe: ::1 */
echo $expanded;

Siehe auch

  • long2ip() - Konvertiert eine Long-Integer-Adresse in einen String, der das (IPv4) Internet-Standard-Punktformat enthält ("Dotted-Format")
  • ip2long() - Konvertiert eine gemäß IPv4-Protokoll angegebene IP-Adresse vom Punkt-Format in ein Long Integer
  • inet_pton() - Konvertiert eine IP-Adresse im menschenlesbaren Format in eine komprimierte in_addr-Darstellung

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User Contributed Notes 4 notes

ryansun81 at gmail dot com
14 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
marcus at synchromedia dot co dot uk
9 years ago
PHP's inet_ntop function is not compatible with the binary representation used by MySQL's INET6_ATON function, assuming you are using the recommended method of storing both IPv4 and IPv6 addresses in a VARBINARY(16) field. You need to convert it like this:

* Convert a MySQL binary v4 (4-byte) or v6 (16-byte) IP address to a printable string.
* @param string $ip A binary string containing an IP address, as returned from MySQL's INET6_ATON function
* @return string Empty if not valid.
function inet6_ntop($ip) {
$l = strlen($ip);
if ($l == 4 or $l == 16) {
return inet_ntop(pack('A' . $l, $ip));
return '';

You don't need a function going the other way because MySQL's INET6_NTOA is already compatible with PHP's inet_pton function.
MagicalTux at FF dot st
19 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 !
PandoraBox2007 at gmail dot com
12 years ago
Before inet_pton nice work


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

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