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.

Mai duba DNS - Neman DNS kyauta (A, AAAA, MX, TXT, NS Records)

Ana shirin dubawa…

Abin da kowane nau'in rikodin DNS ke nufi

Tsarin Sunan Domain yana adana fiye da adireshin yanki. Wannan tambayar mai duba yana raye-rayen DNS akan rufaffen DNS-over-HTTPS kuma yana ba da rahoton kowane nau'in rikodin yankin yana bugawa:

A / AAAA - IPv4 / IPv6 yana ba da adireshin yanki zuwa. Ba tare da aƙalla ɗaya daga cikin waɗannan ba, yanki ba zai iya ɗaukar rukunin yanar gizon ba.
CNAME - wani laƙabin da ke nuna wani suna zuwa wani. Ba a yarda a kan yankin koli ba, don haka example.com ba zai nuna komai ba.
MX - sabar saƙon wasikun da ke karɓar imel don yankin, kowanne yana da fifiko. Babu MX yawanci yana nufin babu imel.
NS - sabobin suna masu iko waɗanda ke amsa yankin.
TXT - Rubutun kyauta: SPF manufofin anti-spoofing, DKIM sanya hannu (akan yanki), alamun tabbatar da ikon mallakar yanki.
CAA - wacce hukumomin takardar shaida aka yarda su ba da takaddun shaida na TLS don yankin.
SOA - metadata na gudanarwa na yankin: uwar garken sunan farko, lamba da masu ƙidayar caching.

Me yasa duba bayanan DNS?

Bayan ƙaura ko gyara DNS - Tabbatar da sabbin bayanan suna gudana akan masu warwarewar jama'a, ba kawai akan ma'ajin kwamfutarka ba.
Isar da imel - Tabbatar da shigarwar SPF/MX daidai ne kafin saƙonnin su fara bouncing.
Binciken tsaro - gano canje-canjen TXT/NS na bazata, kuma tabbatar da cewa CAA ta lissafta CAs ɗin da kuke amfani da su kawai.

Tukwici: Gyaran DNS baya bayyana nan take a ko'ina - kowane TTL na rikodin yana gaya wa masu yanke hukunci tsawon lokacin da za a adana tsohuwar amsar. Rage TTL kafin canje-canjen da aka tsara, sa'an nan kuma ɗaga shi daga baya.

Samu adiresoshin? Duba Domain zuwa IP don cikakken bayanin martaba na adireshi, gudanar da a duba lissafin baƙar fata a kai, ko karanta ta baya DNS.

FAQ

Tambayoyi masu duba DNS

Menene mai duba DNS?

Mai duba DNS yana tambayar Tsarin Sunan Domain don kowane nau'in rikodin yanki - adiresoshin da yake nunawa (A, AAAA), sabar saƙon sa (MX), sabar suna (NS), igiyoyin tabbatarwa (TXT) da manufofin tsaro (CAA) - kuma yana ba da rahoton daidai abin da aka buga.

Me yasa bazan iya ganin rikodin CNAME don tushen yankina ba?

DNS baya ƙyale CNAME akan koli na yanki (example.com kanta) - tushen dole ne yayi amfani da bayanan A/AAAA. Bayanan CNAME suna bayyana ne kawai akan ƙananan yankuna kamar www.misali.com.

Yaya tsawon lokacin canje-canjen DNS ke ɗauka don nunawa?

Kowane rikodin yana ɗaukar TTL (lokacin rayuwa) wanda ke gaya wa masu yanke hukunci tsawon lokacin da za a adana shi - daga daƙiƙa zuwa kwanaki. Bayan gyara rikodin, masu warwarewar jama'a suna ci gaba da ba da tsohuwar amsa har sai TTL ta ƙare, don haka yadawa na iya ɗaukar tsawon TTL ta baya.