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 Sedatus — Free DNS Lookup (A, AAAA, MX, TXT, NS Records)

Praeparans reprehendo…

Quod quisque DNS record genus significat?

Systema Nomen Domain multo plus quam inscriptio electronica reponit. Haec quaestionis tessellatis DNS super encrypted DNS super-HTTPS vivunt, et omne genus recordum renuntiationes ditionum divulgat:

A / AAAA — IPv4/IPv6 alloquitur domain demonstrat. Sine saltem una ex his, dominium locum habere non potest.
CNAME — an alias unum nomen modo demonstrans. Non licet in zona apicem, sic example.com normaliter nemini.
MX - Servatores tabellariorum qui epistulam pro dominio accipiunt, quisque cum prioritate. Non MX plerumque nulla est inscriptio.
NS — nomen auctoritative servientibus pro zona respondentibus.
TXT — textus gratuiti formae: SPF anti-spoofing consilia, DKIM signatio (in subdomains), dominii dominii signa verificationis.
CAA — quae certificatoriae auctoritates permittuntur ut TLS testimoniales pro dominio edant.
SOA - metadata administrativa zonae: nominator primarius, contactus et timers caching.

Cur DNS monumentis reprehendo?

Post migrationem vel DNS edit - Novas tabulas confirmandas in publicis resolutoribus vivunt, non solum in cella computatrum tuo.
Inscriptio deliverability - cognoscere SPF/MX entries sunt rectam coram nuntiis satus bouncing.
Securitatis recognitiones — macula inopinata TXT/NS mutationes, et fac CAA tabulas tantum CAs uteris.

Indicium: DNS emendationes non statim ubique apparent - singulae tabulae TTL narrat resolutores quousque ad responsum vetus cella condiant. Deprime ttl ante mutationem destinatam, deinde iterum postea resuscita.

Inventae sunt inscriptiones? Vide Domain ad IP ad plenam obnoxiam inscriptionis profile, currere a notatione reprehendo in ea vel lege sua vicissim DNS *.

FAQ

DNS checker quaestiones

Quid est DNS tessellatis?

A DNS tessellatis quaerit Domain Nomen System pro singulis actis ditionum - inscriptiones indicat (A, AAAA), servientium epistularum (MX), nomen servers (NS), chordas verificationis (TXT) et rationes securitatis (CAA) — et tradit prorsus quod divulgatur.

Cur non video CNAME testimonium radicis meae fundi?

DNS in apice zonae CNAME non patitur — radix A/AAAA monumentis uti debet. CNAME records tantum apparent in subdomains sicut www.example.com.

Quousque DNS mutationes accipere ostendere sursum?

Singula recorda fert TTL (tempus vivendi) qui resolvers narrat quam longum sit ut illud condiveris — ab secundis in dies. Post edendis instrumentis resolutores publici servientes veteris responsionis servant donec eius TTL exspirat, propagatio tamdiu capere potest quamdiu prior TTL.