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, unless expr
is NULL, in which case the function returns NULL. IPv4-mapped addresses
have the form ::ffff:ipv4_address.

URL: https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html

