dnsPromises.resolveSoa(hostname)

新增于: v10.6.0

hostname <string>

使用 DNS 协议解析 hostname 的权限起始记录（SOA 记录）。成功时，Promise 将以一个具有以下属性的对象形式被解析：

【Uses the DNS protocol to resolve a start of authority record (SOA record) for the hostname. On success, the Promise is resolved with an object with the following properties:】

nsname
hostmaster
serial
refresh
retry
expire
minttl

{
  nsname: 'ns.example.com',
  hostmaster: 'root.example.com',
  serial: 2013101809,
  refresh: 10000,
  retry: 2400,
  expire: 604800,
  minttl: 3600
}