MariaDB starting with 10.0.12
IS_IPV4_MAPPED() has been available since MariaDB 10.0.12.
IS_IPV4_MAPPED(expr)
Returns 1 if a given a numeric binary string IPv6 address, such as returned by INET6_ATON(), is a valid IPv4-mapped address, otherwise returns 0.
MariaDB starting with 10.5.0
From MariaDB 10.5.0, when the argument is not INET6, automatic implicit CAST to INET6 is applied. As a consequence, IS_IPV4_MAPPED
now understands arguments in both text representation and binary(16) representation. Before MariaDB 10.5.0, the function understood only binary(16) representation.
SELECT IS_IPV4_MAPPED(INET6_ATON('::10.0.1.1'));
+------------------------------------------+
| IS_IPV4_MAPPED(INET6_ATON('::10.0.1.1')) |
+------------------------------------------+
| 0 |
+------------------------------------------+
SELECT IS_IPV4_MAPPED(INET6_ATON('::ffff:10.0.1.1'));
+-----------------------------------------------+
| IS_IPV4_MAPPED(INET6_ATON('::ffff:10.0.1.1')) |
+-----------------------------------------------+
| 1 |
+-----------------------------------------------+