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