options { ... allow-transfer { 172.16.10.192; }; ... } zone "example.com" { type master; file "master/example.com"; allow-transfer { 192.168.14.20; 192.168.80.29; }; }; zone "example.org" { type master; file "master/example.com" }; zone "example.net" { type slave; masters { 10.14.102.18; }; file "slave/example.net"; allow-transfer { none; }; }