Private AccessPrivate Access
This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.
Splits an IPv6 address into the IPv6 and IPv4 representation parts
RFC 4291 allows you to represent the last two parts of an IPv6 address using the standard IPv4 representation
Example: 0:0:0:0:0:0:184.108.40.206 0:0:0:0:0:FFFF:220.127.116.11
(string) (Required) An IPv6 address
(array)  contains the IPv6 represented part, and  the IPv4 represented part