DNS 查询
查询域名的常见 DNS 记录类型。DNS 更改可能需要时间传播，缓存解析器在更新期间可能显示不同结果。
When this tool is useful
DNS tells the rest of the web where a domain should point. Use this tool when you want to validate domain setup, troubleshoot reachability, or spot unexpected hosting and mail routing changes.
The tool is read-only: it checks a single domain at a time and returns only the selected record type.
Best use cases
- Checking whether a domain points to the expected web server.
- Finding potential typos in email infrastructure by reading MX priorities.
- Verifying whether a CDN front-end and backend host are both represented.
How to use DNS lookup
Enter a valid domain and choose one record type to fetch the latest authoritative answer path available to resolvers.
A practical workflow
- Start with A and AAAA. If both differ, confirm whether a service intentionally supports IPv4-only or IPv6-only paths.
- Use CNAME only when you are debugging canonical host mapping in subdomains.
- Use MX when you verify where email for the domain is delivered.
- Use TXT for SPF, DKIM, and domain verification hints.
- Use NS to confirm the authoritative name servers shown on most control panels.
输入域名并选择 DNS 记录类型。
Common checks before changing DNS
Why do answers differ between networks?
Some resolvers use different cache states, so propagation time and existing cache TTL can create short windows with old values.
Can this tool replace full DNS diagnostics?
No. For full diagnostics use packet-level tools and TTL analysis, but this lookup is enough for most configuration verification.