递归DNS解析器
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://tldfyi.com/iframe/glossary/recursive-dns/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://tldfyi.com/glossary/recursive-dns/Add a dynamic SVG badge to your README or docs.
[](https://tldfyi.com/glossary/recursive-dns/)Use the native HTML custom element.
递归DNS解析器是一种接受客户端[[dns|DNS]]查询并代为执行完整解析流程的服务器，从[[dns-root-server|根域名服务器]]开始，沿DNS层级逐步向下查询，直至找到被查询域名的[[authoritative-dns|权威服务器]]。与[[authoritative-dns|权威服务器]]不同，递归解析器充当中间人角色：根据每条记录的[[ttl|TTL]]缓存响应，从而降低延迟和上游查询负担。ISP运营的解析器、Cloudflare 1.1.1.1和Google 8.8.8.8等公共服务以及企业DNS服务器均作为递归解析器运行。[[dns-over-https|DNS over HTTPS]]和[[dns-over-tls|DNS over TLS]]对客户端与递归解析器之间的通道进行加密，以防止窃听。
示例
When you visit example.com, your laptop sends a query to the recursive resolver at 1.1.1.1, which contacts root, .com TLD, and authoritative nameservers in sequence before returning the IP — subsequent users hitting 1.1.1.1 receive the cached answer instantly.