stackexchange-dnscontrol/documentation/functions/domain/SOA.md

name	parameters	parameter_types
SOA	name ns mbox refresh retry expire minttl modifiers...	name ns mbox refresh retry expire minttl modifiers... string string string number number number number RecordModifier[]

SOA adds an SOA record to a domain. The name should be @. ns and mbox are strings. The other fields are unsigned 32-bit ints.

D("example.com", REG_THIRDPARTY, DnsProvider("DNS_BIND"),
  SOA("@", "ns3.example.org.", "hostmaster.example.org.", 3600, 600, 604800, 1440),
);

Notes

• The serial number is managed automatically. It isn't even a field in SOA().
• Most providers automatically generate SOA records. They will ignore any SOA() statements.

There is more info about SOA in the documentation for the BIND provider.