example. 3600 IN SOA n1.example. hostmaster.ns1.example. 1 3600 1200 604800 7200 example. 3600 IN NS ns2.example. example. 3600 IN NS ns3.example. ns1.example. 3600 IN A 10.53.0.1 ns2.example. 3600 IN A 10.53.0.2 ns3.example. 3600 IN A 10.53.0.3 example. 3600 IN SOA n1.example. hostmaster.ns1.example. 1 3600 1200 604800 7200