$TTL 600
example.com. IN SOA ns1.foo.com. john.doe.foo.com. 2023110717 28800 7200 604800 7200

@ 86400 IN NS ns1.foo.com.
@ 86400 IN NS ns2.foo.com.
@ 86400 IN NS ns3.foo.com.
@ IN A 1.2.3.4
