example.com. IN  SOA  ns.example.com. admin.example.com. (
                        2020250101 ; serial
                        28800      ; refresh (8 hours)
                        7200       ; retry (2 hours)
                        2419200    ; expire (4 weeks)
                        300        ; minimum (5 minutes)
                        )

example.com. 84600 IN NS ns.example.com.

srv1.example.com. 600 IN A 198.51.100.3
srv1.example.com. 600 IN AAAA 2001:db8:cafe:bc68::2
www 600 IN CNAME srv1