[{"data":1,"prerenderedAt":60},["ShallowReactive",2],{"$f1g0nuby6xzkr":3},{"title":4,"seoTitle":5,"description":6,"route":7,"kind":8,"toolKey":9,"intro":10,"indexable":11,"sections":12,"related":56},"DNS 查询与在线 NSLookup","DNS 查询与在线 NSLookup | nslookup.online","在线查询域名的 DNS 记录、TTL 和公共解析器响应。支持多种记录类型，解释 NXDOMAIN、SERVFAIL 与无记录状态。","\u002Fzh\u002F","tool","dns","使用公共解析器查询 DNS，理解记录及其响应含义。",true,[13,20,44,50],{"id":14,"title":15,"paragraphs":16,"code":19},"read-answer","读懂响应，而不只是查看记录",[17,18],"DNS 查询向解析器询问某个名称对应的记录。请输入准确的主机名并选择类型。结果只代表所选解析器在查询时的视图，不是互联网所有 DNS 服务器的调查。","查询 IPv4 地址选 A，IPv6 选 AAAA。保持主机名不变可切换到邮件、验证文本或域名服务器记录。“常用记录”分别发送六类查询，并非不可靠的 ANY 请求。","example.com.    300    IN    A    192.0.2.10\n名称            TTL   类别 类型 值\n\n文档示例 — 非实时 DNS 响应",{"id":21,"title":22,"paragraphs":23,"rows":25},"reference","DNS 响应的各个字段",[24],"名称表示记录发布的位置，类型决定如何解释值，TTL 是以秒计的缓存有效期。TTL 不是全球传播完成时间，也不保证所有用户同时看到更改。",[26,29,32,35,38,41],{"label":27,"value":28},"A \u002F AAAA","此名称的 IPv4 \u002F IPv6 地址。",{"label":30,"value":31},"MX","邮件路由目标及数值优先级。",{"label":33,"value":34},"TXT","验证文本与邮件策略。",{"label":36,"value":37},"CNAME","一个 DNS 名称指向另一个名称的别名。",{"label":39,"value":40},"NS \u002F SOA","域名服务器及区域权威元数据。",{"label":42,"value":43},"PTR \u002F SRV \u002F CAA","反向名称、服务目标或证书颁发机构授权。",{"id":45,"title":46,"paragraphs":47},"different-answers","为什么两个 DNS 工具的答案不同",[48,49],"不同解析器可能缓存了不同版本，也可能访问不同的权威基础设施，受到路由与配置影响。比较 Google 和 Cloudflare 是解析器对照，不能称为全球传播检测。","HTTPS 往返耗时包含浏览器网络、TLS、服务和响应传输开销，并非权威服务器的纯解析耗时，不应用于给解析器排名。",{"id":51,"title":52,"paragraphs":53},"questions","常见问题",[54,55],"NOERROR 但没有目标类型记录，不等于名称不存在。NXDOMAIN 表示所选解析器报告查询名称不存在，并不表示该域名可以注册。","SERVFAIL、REFUSED 和网络超时含义不同。HTTP 或网络故障不是 DNS 状态结论；请保留已成功的记录，手动重试或选择另一个解析器。",[57,58,59],"\u002Fguides\u002Fnslookup-command\u002F","\u002Fguides\u002Fa-record-vs-cname\u002F","\u002Fmx-lookup\u002F",1792661399207]