::ffff:0:0/96 is for representing v4 addresses in v6 APIs. You shouldn't even see it on the wire at all, but if you do it's just a regular v6 bogon range and no

::ffff:0:0/96 is for representing v4 addresses in v6 APIs. You shouldn't even see it on the wire at all, but if you do it's just a regular v6 bogon range and not anything to do with v4, so it doesn't get or need any special handling in firewalls or routers.