云解析 DNS

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什么是反向解析？
域名反向解析即从 IP 地址到域名的映射，由于正向的解析是从域名到 IP 地址的映射，如果要确认一个 IP 地址是否对应一个或者多个域名，需要从 IP 出发遍历整个域名系统，这是无法实现的，因此 RFC1035 定义了 PTR（Pointer Record）记录，指针记录是邮箱系统中的一个数据类型，与 A 记录对应，PTR 记录将 IP 地址指向域名。
关于 PTR 记录详情请参见 PTR 反向解析增值服务。

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