DNS查询
查询任意域名的DNS记录（A、AAAA、MX、TXT、NS、CNAME）。适用于排查邮件、主机托管和SSL配置问题。
如何使用本工具
- 1
Type a domain name such as example.com into the input field (enter the bare domain, not a full https:// URL).
- 2
Click Lookup DNS to send the query.
- 3
Read the returned record sets in the JSON panel below, grouped by record type (A, AAAA, NS, SOA, MX, TXT).
- 4
Edit the domain and run it again to compare another host or re-check after a DNS change.
什么是DNS？
DNS（域名系统）将人类可读的域名映射到机器的IP地址。每当你访问一个网站时，浏览器都会向DNS服务器查询托管该网站的IP地址。DNS记录控制的不仅仅是IP地址：MX记录负责路由邮件，TXT记录保存验证令牌和SPF信息，NS记录则定义哪个DNS服务商具有权威性。本工具直接向权威DNS服务器查询，以获取最新数据。
常见使用场景
Confirm an A or AAAA record points to the right server IP after migrating hosting providers.
Check MX records and their priorities when email is bouncing or not being delivered.
Verify a TXT record for SPF, DKIM, or a domain-ownership token required by Google, Microsoft, or an SSL issuer.
Find which name servers (NS) are authoritative for a domain before or after a registrar transfer.
Inspect the SOA serial number to see whether a recent zone change has actually been published.
Quickly compare the published records of two domains side by side while troubleshooting.