(PHP 5 >= 5.1.0)

inet_ptonConverts a human readable IP address to its packed in_addr representation


string inet_pton ( string $address )

This function converts a human readable IPv4 or IPv6 address (if PHP was built with IPv6 support enabled) into an address family appropriate 32bit or 128bit binary structure.



A human readable IPv4 or IPv6 address.

Valor Retornado

Returns the in_addr representation of the given address, or FALSE if a syntactically invalid address is given (for example, an IPv4 address without dots or an IPv6 address without colons).


Exemplo #1 inet_pton() Example

$in6_addr inet_pton('::1');


Versão Descrição
5.3.0 This function is now available on Windows platforms.

Veja Também

  • ip2long() - Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address
  • long2ip() - Converts an (IPv4) Internet network address into a string in Internet standard dotted format
  • inet_ntop() - Converts a packed internet address to a human readable representation

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User Contributed Notes 4 notes

me at diogoresende dot net
7 years ago
If you want to use the above function you should test for ':' character before '.'. Meaning, you should check if it's an ipv6 address before checking for ipv4.
Why? IPv6 allows this type of notation:


If you check for '.' character you will think this is an ipv4 address and it will fail.
strata_ranger at hotmail dot com
4 years ago
If the input string is not a readable IP address, inet_pton() generates an E_WARNING and returns FALSE.  The same is true for inet_ntop().

Also, inet_pton() does not recognize netmask notation (e.g: "" or "1:2::3:4/64") in the input string.  This differs from how some database systems (like postgreSQL) support IP address types, so if you need that sort of functionality when processing IP addresses in PHP you'll have to write it in yourself.

A rough example:


// Sample IP addresses
$ipaddr = ''; // IPv4 with /24 netmask
$ipaddr = '1:2::3:4/64'; // IPv6 with /64 netmask

// Strip out the netmask, if there is one.
$cx = strpos($ipaddr, '/');
if (
$subnet = (int)(substr($ipaddr, $cx+1));
$ipaddr = substr($ipaddr, 0, $cx);
$subnet = null; // No netmask present

// Convert address to packed format
$addr = inet_pton($ipaddr);

// Let's display it as hexadecimal format
foreach(str_split($addr) as $char) echo str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT);
"<br />\n";

// Convert the netmask
if (is_integer($subnet))
// Maximum netmask length = same as packed address
$len = 8*strlen($addr);
  if (
$subnet > $len) $subnet = $len;
// Create a hex expression of the subnet mask
$mask  = str_repeat('f', $subnet>>2);
$subnet & 3)
3: $mask .= 'e'; break;
2: $mask .= 'c'; break;
1: $mask .= '8'; break;
$mask = str_pad($mask, $len>>2, '0');

// Packed representation of netmask
$mask = pack('H*', $mask);

// Display the netmask as hexadecimal
foreach(str_split($mask) as $char) echo str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT);

francis dot besset at gmail dot com
2 years ago
It is possible to verify if PHP was compiled with --disable-ipv6 option by AF_INET6 constant.


if (defined('AF_INET6')) {
"PHP was compiled without --disable-ipv6 option";
} else {
"PHP was compiled with --disable-ipv6 option";

eric at vyncke org
6 years ago
Not so easy in the function below... It is not handling the case of '::' which can happen in an IPv6 and represents any number of 0, addresses could be as simple as ff05::1
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