Configure DNS64 in Bind9 on Ubuntu

vim /etc/bind/named.conf.options

options {
        ...
        ...
        listen-on-v6 { any; };
        allow-query { 2401:ed80:1000::/48; };
        recursion yes;
        dns64 64:ff9b::/96 {
               clients { any; };
               mapped { any; };
               exclude {0::/3; 2001:db8::/32;};
               };
        };