DNS lookup
DNS lookup個でany domain: see its IP addresses、mail servers, 名前 servers, TXT、other records.
Queries go〜Cloudflare’s public DNS over HTTPS service when you press the button.
DNS lookupについて
DNS lookup個でany domain: see its IP addresses、mail servers, 名前 servers, TXT、other records.
SmartCalcyの「データとネットワーク」セクションの一部です。アカウント不要でブラウザ上で動作し、お使いの通貨と単位（ページ上部で変更可）を使います。結果は参考用の目安なので、頼る前に公的な情報をご確認ください。
DNS lookupの使い方
何を計算するか、いつ使うか
a domain name: its IPv4 Looks up the DNS recordsとIPv6 addresses (AとAAAA)、mail servers (MX), 名前 servers (NS), text records (TXT), aliases (CNAME), ゾーン 詳細 (SOA)、certificate rules (CAA). Use it〜check that a domain points where you expect、or〜debug email、website set-up.
使い方の手順
- Type a domain 名前 such as 例.com.
- Choose a record type,または継続 “All common records”.
- Press “Look up DNS”.
- Read 1個あたり record card. TTLはhow many 秒 the answer may be cached.です
各入力項目の意味
- Domain 名前 – The domain〜look up. Web addresses are cleaned〜the domain, so https://example.com/page also works.
- Record type – One record type,またはall the common ones.
結果の読み方
- AとAAAA – The IPv4とIPv6 addresses the 名前 点の数 終了.
- MX – Mail servers, with a priority 数値. Lower 数値 are tried first.
- NS, TXT, CNAME, SOA, CAA – 名前 servers、text records such as SPF, aliases, ゾーン authority、which certificate authorities may issue certificates.
計算式
No calculation. The browser asks Cloudflare’s public DNS over HTTPS service個でeach record typeとshows the answers it gets. TTLはseconds that resolvers may cache an answer.のthe timeです
計算例
example.com returns an A record with an IPv4 address A lookup、MX records個でmail,、TXT records including its SPF policy.
前提と限界
- Answers come 開始 a public resolverとmay be cached個でup〜the TTL, so a change made a few minutes ago may not show yet.
- The lookupはmade when you press the button.です
- Only the common record types are offered.
よくある間違い
- Typing a full web address with a pa乗とexpecting records個でthe page. DNS works on domain names only.
- Expecting a 変動〜表示内容 immediately. Caches hold old answers 空き終了 the TTL runs out.
- Looking up a subdomain you have not created, which returns いいえ records.
よくある質問
Whatはa DNS record?です
An entry that tells the internet something about a domain, such as which server hosts its websiteまたはhandles its email.
What does TTL 平均?
時刻〜seconds. Itのlive,はhow long other servers may reuse an answer before asking again.です
Why are there several MX records?
They give backup mail servers. The one with the lowest priority 数値はtried first.です
What does NXDOMAIN 平均?
The domain does not exist, so check the spelling.
缶 I look up an MX record only?
the record type list.のはい. Choose MX