Pseudo IPv4

Pseudo IPv4 is a library which converts IPv6 address to IPv4 in Class E space (240.0.0.0 - 255.255.255.255). It can be helpful if your app operates with IPv4 only but the customer uses IPv6. For more information see CloudFlare solution

How it works

Pseudo IPv4 determines if given address is 6to4 and gets original IPv4. Otherwise it gets 8 first bytes from given IPv6 address and converts them to 4 bytes.

Installation

composer require ossinkine/pseudo-ipv4

Usage

Create a converter instance and pass an IPv6 address into it.

use Ossinkine\PseudoIpv4\PseudoIpv4Converter;

$ipv6 = '2001:0db8:11a3:09d7:1f34:8a2e:07a0:765d';
$converter = new PseudoIpv4Converter();
$ipv4 = $converter->convert($ipv6);

If you unsure the address is IPv6 you can catch an appropriate exception.

use Ossinkine\PseudoIpv4\Exception\WrongIpv6Exception;
use Ossinkine\PseudoIpv4\PseudoIpv4Converter;

$ip = $_SERVER['REMOTE_ADDR'];
$converter = new PseudoIpv4Converter();
try {
    $ipv4 = $converter->convert($ip);
} catch (WrongIpv6Exception $exception) {
    $ipv4 = $ip;
}

License

Pseudo IPv4 is licensed under the MIT license.