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.

DNS Checker - Dawb DNS Lookup (A, AAAA, MX, TXT, NS Records)

Kev npaj kos…

Dab tsi txhua hom ntaub ntawv DNS txhais tau li cas

Domain Name System khaws ntau dua li qhov chaw nyob. Qhov no checker queries nyob DNS dhau encrypted DNS-dhau-HTTPS thiab tshaj tawm txhua hom ntaub ntawv sau npe luam tawm:

A / AAAA - IPv4 / IPv6 chaw nyob cov ntsiab lus sau rau. Yog tsis muaj tsawg kawg yog ib qho ntawm cov no, tus sau npe tsis tuaj yeem tuav lub vev xaib.
CNAME - ib tug alias taw ib lub npe rau lwm tus. Tsis pub rau thaj tsam apex, yog li ntawd example.com ib txwm yuav tsis qhia.
MX - mail servers uas tau txais email rau lub npe, txhua tus muaj qhov tseem ceeb. Tsis muaj MX feem ntau txhais tau tias tsis muaj email.
NS - cov ntawv tso cai lub npe servers uas teb rau thaj tsam.
TXT - Cov ntawv nyeem dawb: SPF cov cai tiv thaiv kev dag, DKIM kos npe (ntawm subdomains), domain-ownership verification tokens.
CAA - cov tub ceev xwm daim ntawv pov thawj twg raug tso cai tawm TLS daim ntawv pov thawj rau lub npe.
SOA - thaj chaw tswj hwm metadata: thawj nameserver, tiv tauj thiab caching timers.

Vim li cas thiaj kuaj DNS cov ntaub ntawv?

Tom qab kev tsiv teb tsaws lossis DNS hloov - paub meej tias cov ntaub ntawv tshiab nyob ntawm cov neeg daws teeb meem pej xeem, tsis yog ntawm koj tus kheej lub khoos phis tawj cache.
Email xa tuaj - txheeb xyuas SPF / MX nkag yog qhov tseeb ua ntej cov lus pib dhia.
Kev tshuaj xyuas kev ruaj ntseg - pom TXT / NS kev hloov pauv, thiab xyuas kom CAA tsuas yog CA uas koj siv.

Tswv yim: DNS edits tsis tshwm sim tam sim ntawd txhua qhov chaw - txhua cov ntaub ntawv TTL qhia cov neeg daws teeb meem ntev npaum li cas rau cache cov lus teb qub. Txo TTL ua ntej kev hloov pauv, tom qab ntawd tsa nws dua tom qab.

Nrhiav tau qhov chaw nyob? Saib Domain rau IP rau tag nrho hosting profile ntawm qhov chaw nyob, khiav a daim ntawv teev npe dub ntawm nws, los yog nyeem nws rov DNS.

FAQ

DNS checker cov lus nug

DNS checker yog dab tsi?

Tus kws tshuaj xyuas DNS nug txog Domain Name System rau txhua hom ntaub ntawv sau npe - qhov chaw nyob nws taw qhia rau (A, AAAA), nws cov ntawv xa ntawv (MX), npe servers (NS), cov ntaub ntawv pov thawj (TXT) thiab cov cai tswj hwm kev nyab xeeb (CAA) - thiab tshaj tawm raws nraim qhov tau tshaj tawm.

Vim li cas kuv tsis tuaj yeem pom CNAME cov ntaub ntawv rau kuv tus sau lub hauv paus?

DNS tsis tso cai rau CNAME ntawm thaj tsam apex (example.com nws tus kheej) - lub hauv paus yuav tsum siv A/AAAA cov ntaub ntawv. CNAME cov ntaub ntawv tsuas yog tshwm sim ntawm subdomains nyiam www.example.com.

Yuav ntev npaum li cas cov kev hloov DNS yuav tshwm sim?

Txhua cov ntaub ntawv muaj TTL (lub sijhawm ua neej nyob) uas qhia cov neeg daws teeb meem ntev npaum li cas rau cache nws - los ntawm vib nas this mus rau hnub. Tom qab kho cov ntaub ntawv, cov neeg daws teeb meem pej xeem tseem ua haujlwm rau cov lus teb qub kom txog thaum nws TTL tas sij hawm, yog li kev nthuav tawm tuaj yeem siv ntev npaum li TTL yav dhau los.