What is a DNS checker?

A DNS checker queries the Domain Name System for every record type of a domain — the addresses it points to (A, AAAA), its mail servers (MX), name servers (NS), verification strings (TXT) and security policies (CAA) — and reports exactly what is published.

Why can't I see a CNAME record for my domain's root?

DNS does not allow a CNAME on the zone apex (example.com itself) — the root must use A/AAAA records. CNAME records only appear on subdomains like www.example.com.

How long do DNS changes take to show up?

Each record carries a TTL (time to live) that tells resolvers how long to cache it — from seconds to days. After editing a record, public resolvers keep serving the old answer until its TTL expires, so propagation can take as long as the previous TTL.

Onye nwe DNS - Nchọgharị DNS efu (A, AAAA, MX, TXT, NS Records)

Na-akwado nlele…

Ihe ụdị ndekọ DNS ọ bụla pụtara

Sistemụ Aha ngalaba na-echekwa karịa adreesị ngalaba. Nke a na-enyocha ajụjụ na-ebi ndụ DNS n'elu DNS-over-HTTPS ezoro ezo ma na-akọ ụdị ndekọ ọ bụla ngalaba na-ebipụta:

A / AAAA - IPv4 / IPv6 na-agwa ngalaba na-ezo aka. Enweghị opekata mpe otu n'ime ndị a, ngalaba enweghị ike ịnabata weebụsaịtị.
CNAME - utu aha na-atụ otu aha na ọzọ. Ekweghị na oke mpaghara, yabụ example.com agaghị egosikarị nke ọ bụla.
MX - sava ozi na-enweta ozi-e maka ngalaba, nke ọ bụla nwere ihe kacha mkpa. Ọ dịghị MX na-apụtakarị enweghị email.
NS - sava aha ikike na-aza mpaghara ahụ.
TXT - ederede ụdị efu: Amụma mgbochi mkparị SPF, mbinye aka DKIM (na subdomains), akara nkwenye ngalaba-nwe.
CAA - nke ndị ikike asambodo anabatara ịnye asambodo TLS maka ngalaba ahụ.
SOA - metadata nhazi nke mpaghara: ihe nkesa aha mbụ, kọntaktị na oge caching.

Kedu ihe kpatara ịlele ndekọ DNS?

Mgbe njem ma ọ bụ DNS edit - gosi na ndekọ ọhụrụ ahụ dị na ndị na-ekpebi ọha, ọ bụghị naanị na cache kọmputa nke gị.
Nnweta ozi-e - gosi na ndenye SPF/MX ziri ezi tupu ozi amalite ịgbawa.
Nyocha nchekwa - hụ mgbanwe TXT/NS na-atụghị anya ya, wee hụ na CAA depụtara naanị CA ndị ị na-eji.

Ndụmọdụ: Ndezi DNS anaghị apụta ozugbo ebe niile - TTL ndekọ ọ bụla na-agwa ndị na-ekpebi ogologo oge ha ga-echekwa azịza ochie. Wetuo TTL tupu mgbanwe emebere, wee welie ya ọzọ ma emechaa.

Chọtara adreesị ndị ahụ? Lee Ngalaba na IP maka profaịlụ nnabata zuru oke nke adreesị, gbaa a nyochaa blacklist na ya, ma ọ bụ gụọ ya tụgharịa DNS.

FAQ

Ajụjụ nyocha DNS

Kedu ihe bụ onye nyocha DNS?

Onye nyocha DNS na-ajụ Sistemụ Aha ngalaba maka ụdị ndekọ ọ bụla nke ngalaba - adreesị ndị ọ na-arụtụ aka na (A, AAAA), sava ozi ya (MX), sava aha (NS), eriri nkwenye (TXT) na amụma nchekwa (CAA) - ma na-akọ kpọmkwem ihe e bipụtara.

Kedu ihe kpatara na enweghị m ike ịhụ ndekọ CNAME maka mgbọrọgwụ ngalaba m?

DNS anaghị ekwe ka CNAME na mpaghara apex (example.com n'onwe ya) - mgbọrọgwụ ga-eji ndekọ A/AAAA. Ihe ndekọ CNAME na-apụta naanị na subdomains dị ka www.ihe atụ.com.

Ogologo oge ole ka mgbanwe DNS na-ewe iji gosi?

Ndekọ ọ bụla na-ebu TTL (oge ndụ) nke na-agwa ndị na-ekpebi ogologo oge ha ga-echekwa ya - site na sekọnd ruo ụbọchị. Mgbe edezichara ndekọ, ndị na-eme mkpebi ọha na-aga n'ihu na-aza azịza ochie ruo mgbe TTL ga-agwụ, yabụ mgbasa nwere ike were ogologo oge TTL gara aga.