云解析 DNS

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文档中心云解析 DNS 常见问题 PTR 反向解析相关

PTR 反向解析相关

最近更新时间：2024-04-26 18:03:31

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什么是 PTR 反向解析？

什么是 PTR 反向解析？
PTR 反向解析是从 IP 地址到域名的映射，相对于将域名映射到 IP 地址的正向解析。
因为一个 IP 可能被多个域名使用，所以在进行反向解析时要先验证一个 IP 地址是否对应一个或者多个域名。若从 IP 出发遍历整个 DNS 系统来验证，将会因工程浩大而无法实现。因此，RFC1035 定义了 PTR（Pointer Record）记录。PTR 记录将 IP 地址指向域名。
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