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.

Olu DNS - Ṣẹṣẹṣẹ DNS ọfẹ (A, AAAA, MX, TXT, Awọn iwọn NS)

Ngbaradi ayẹwo…

Kini iru igbasilẹ DNS kọọkan tumọ si

Eto Orukọ Ibugbe n tọju pupọ diẹ sii ju adirẹsi agbegbe kan lọ. Awọn ibeere oluyẹwo yii n gbe DNS laaye lori DNS-over-HTTPS ti paroko ati ṣe ijabọ gbogbo iru igbasilẹ ti agbegbe naa ṣe atẹjade:

A / AAAA - IPv4 / IPv6 koju awọn aaye aaye si. Laisi o kere ju ọkan ninu iwọnyi, agbegbe ko le gbalejo oju opo wẹẹbu kan.
CNAME - inagijẹ ti n tọka orukọ kan si ekeji. Ko gba laaye lori agbegbe apex, bẹ example.com yoo deede han kò.
MX - awọn olupin meeli ti o gba imeeli fun agbegbe naa, ọkọọkan pẹlu pataki. Ko si MX nigbagbogbo tumọ si imeeli.
NS - awọn olupin orukọ ti o ni aṣẹ ti o dahun fun agbegbe naa.
TXT - ọrọ fọọmu ọfẹ: Awọn ilana imudako-spoofing SPF, iforukọsilẹ DKIM (lori awọn ile-iṣẹ subdomains), awọn ami ijẹrisi-ašẹ.
CAA - awọn alaṣẹ ijẹrisi wo ni a gba laaye lati fun awọn iwe-ẹri TLS fun agbegbe naa.
SOA - metadata iṣakoso agbegbe ti agbegbe: olupin orukọ akọkọ, olubasọrọ ati awọn aago caching.

Kini idi ti o ṣayẹwo awọn igbasilẹ DNS?

Lẹhin iṣiwa tabi satunkọ DNS - jẹrisi pe awọn igbasilẹ tuntun wa laaye lori awọn ipinnu gbangba, kii ṣe lori kaṣe kọnputa tirẹ nikan.
Imeeli ifijiṣẹ - rii daju pe awọn titẹ sii SPF/MX tọ ṣaaju ki awọn ifiranṣẹ to bẹrẹ bouncing.
Aabo agbeyewo - iranran awọn ayipada TXT/NS airotẹlẹ, ati rii daju pe CAA ṣe atokọ awọn CA nikan ti o lo.

Imọran: Awọn atunṣe DNS ko han lẹsẹkẹsẹ nibi gbogbo - TTL igbasilẹ kọọkan sọ fun awọn ipinnu bi o ṣe pẹ to lati kaṣe idahun atijọ. Sokale TTL ṣaaju iyipada ti a pinnu, lẹhinna gbe soke lẹẹkansi lẹhinna.

Ri awọn adirẹsi? Wo Ibugbe si IP fun ni kikun alejo profaili ti ẹya adirẹsi, ṣiṣe a blacklist ayẹwo lori rẹ, tabi ka rẹ yiyipada DNS.

FAQ

Awọn ibeere oluyẹwo DNS

Kini oluyẹwo DNS?

Oluyẹwo DNS n beere Eto Orukọ Aṣẹ fun gbogbo iru igbasilẹ ti agbegbe kan - awọn adirẹsi ti o tọka si (A, AAAA), awọn olupin meeli rẹ (MX), awọn olupin orukọ (NS), awọn okun ijẹrisi (TXT) ati awọn eto imulo aabo (CAA) - ati awọn ijabọ gangan ohun ti a tẹjade.

Kini idi ti Emi ko le rii igbasilẹ CNAME kan fun gbongbo agbegbe mi?

DNS ko gba CNAME laaye lori agbegbe apex (example.com funrararẹ) - gbongbo gbọdọ lo awọn igbasilẹ A/AAAA. Awọn igbasilẹ CNAME han nikan lori awọn subdomains bii www.apẹẹrẹ.com.

Bawo ni awọn ayipada DNS ṣe pẹ to lati ṣafihan?

Igbasilẹ kọọkan n gbe TTL kan (akoko lati gbe) ti o sọ fun awọn ipinnu bi o ṣe pẹ to lati kaṣe - lati iṣẹju-aaya si awọn ọjọ. Lẹhin ṣiṣatunṣe igbasilẹ kan, awọn ipinnu gbogbo eniyan tẹsiwaju lati sin idahun atijọ titi TTL rẹ yoo fi pari, nitorinaa ikede le gba niwọn igba ti TTL ti tẹlẹ.