/etc/named.conf.acl

acl "corporate" {
        10.30.1.0/24; 
        2001:db8:3:331::/64;
};

acl "public" {
        10.30.2.0/24; 
        2001:db8:3:336::/64;
};

acl "admin" {
        10.30.130.0/24;
        2001:db8:3:2::/64;
};