dns.resolvePtr(hostname, callback)

• hostname <string>
• callback <Function>
  • err <Error>
  • addresses <string[]>

使用域名系统协议解析 hostname 的指针记录（PTR 记录）。 传给 callback 函数的 addresses 参数将是包含回复记录的字符串数组。

• hostname <string>
• callback <Function>
  • err <Error>
  • addresses <string[]>

Uses the DNS protocol to resolve pointer records (PTR records) for the hostname. The addresses argument passed to the callback function will be an array of strings containing the reply records.