Syntax:
IS_IPV4_MAPPED(expr)

This function takes an IPv6 address represented in numeric form as a
binary string, as returned by INET6_ATON(). It returns 1 if the
argument is a valid IPv4-mapped IPv6 address, 0 otherwise. IPv4-mapped
addresses have the form ::ffff:ipv4_address.

URL: http://dev.mysql.com/doc/refman/5.6/en/miscellaneous-functions.html

