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.
透過加密的公共 DNS-over-HTTPS 解析器查詢 A、AAAA、MX、TXT、NS、CNAME 與 CAA 記錄。
DNS 傳播檢查器比較多個獨立公共解析器回傳的 DNS 記錄，檢查近期 DNS 變更是否已獲得一致結果。
反向 DNS 查詢使用加密公共 DNS 查詢 IPv4 或 IPv6 位址發布的可選 PTR 主機名稱。
NS 名稱伺服器查詢透過加密公共 DNS 查詢網域的權威名稱伺服器及其 DNS TTL。
TXT 記錄查詢查詢用於網域驗證、郵件政策及其他網域設定的公共 DNS TXT 記錄。
CNAME 記錄查詢檢查 DNS CNAME 別名指向的標準主機名稱並查看 TTL。
MX 郵件伺服器查詢透過加密公共 DNS 查詢網域的郵件伺服器、優先順序與 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.