Requests_IPv6::split_v6_v4( string $ip )

Splits an IPv6 address into the IPv6 and IPv4 representation parts

Description

RFC 4291 allows you to represent the last two parts of an IPv6 address using the standard IPv4 representation

Example: 0:0:0:0:0:0:13.1.68.3 0:0:0:0:0:FFFF:129.144.52.38

Parameters

$ip

(string) (Required) An IPv6 address

Return

(string[]) [0] contains the IPv6 represented part, and [1] the IPv4 represented part

Source

File: wp-includes/Requests/IPv6.php 

protected static function split_v6_v4($ip) {
		if (strpos($ip, '.') !== false) {
			$pos       = strrpos($ip, ':');
			$ipv6_part = substr($ip, 0, $pos);
			$ipv4_part = substr($ip, $pos + 1);
			return array($ipv6_part, $ipv4_part);
		}
		else {
			return array($ip, '');
		}
	}

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https://developer.wordpress.org/reference/classes/requests_ipv6/split_v6_v4