DNS Tools
DNS tools help you see the public records that connect domain names to websites, mail systems, verification services and security policy.
Focused tools for this topic
Look up DNS records, compare resolver answers and troubleshoot DNS changes with practical DNS tools and guides.
通过加密的公共 DNS-over-HTTPS 解析器查询 A、AAAA、MX、TXT、NS、CNAME 与 CAA 记录。
DNS 传播检查器比较多个独立公共解析器返回的 DNS 记录，检查近期 DNS 更改是否已获得一致结果。
反向 DNS 查询使用加密公共 DNS 查询 IPv4 或 IPv6 地址发布的可选 PTR 主机名。
NS 名称服务器查询通过加密公共 DNS 查询域名的权威名称服务器及其 DNS TTL。
TXT 记录查询查询用于域名验证、邮件策略及其他域名配置的公共 DNS TXT 记录。
CNAME 记录查询检查 DNS CNAME 别名指向的规范主机名并查看 TTL。
MX 邮件服务器查询通过加密公共 DNS 查询域名的邮件服务器、优先级与 TTL。
Dedicated A Lookup, Dedicated AAAA Lookup
What to know before using these checks
A practical DNS workflow
Start with a broad DNS lookup to confirm the record value. If a recent change looks inconsistent, compare multiple public resolvers with the propagation checker.
Use focused record lookups when you already know the record family you need to validate, such as MX for mail routing or TXT for domain verification.
Learn the concepts behind the tools
A practical explanation of DNS, the system that connects domain names to IP addresses and service records.
DNS Record Types ExplainedUnderstand common DNS record types including A, AAAA, CNAME, MX, TXT, NS, CAA and PTR.
A vs AAAA RecordLearn the difference between DNS A records for IPv4 and AAAA records for IPv6.
DNS Propagation ExplainedUnderstand why DNS changes appear at different times across resolvers and how TTL affects propagation.
Common questions
Does DNS propagation mean every resolver updates at the same time?
No. Resolvers cache records according to TTL values and local policy, so different networks can briefly return different answers.
Should a domain use both A and AAAA records?
Only when the service is reachable over both IPv4 and IPv6. Publishing an AAAA record before IPv6 is ready can cause connection failures for some users.