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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; };
}