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.

Kugenzura DNS - Kureba DNS Yubusa (A, AAAA, MX, TXT, NS Records)

Gutegura cheque…

Icyo buri bwoko bwa DNS bwanditse busobanura

Sisitemu Izina rya Sisitemu ibika byinshi birenze aderesi ya domaine. Uyu mugenzuzi abaza DNS hejuru ya DNS ihishe-hejuru ya HTTPS kandi ikanatanga raporo buri bwoko bwanditse domaine itangaza:

A / AAAA - IPv4 / IPv6 yerekana aderesi yerekanwe. Hatariho byibura kimwe muribi, indangarubuga ntishobora kwakira urubuga.
CNAME - alias yerekana izina rimwe kurindi. Ntabwo byemewe kuri zone apex, so example.com Ubusanzwe Nta na kimwe.
MX - imeri ya seriveri yakira imeri kumurongo, buriwese ufite icyambere. Nta MX mubisanzwe bivuze ko nta imeri.
NS - amazina yemewe ya seriveri asubiza kuri zone.
TXT - inyandiko-yubuntu: politiki ya SPF yo kurwanya ruswa, gusinya DKIM (kuri subdomain), ibimenyetso byerekana nyirubwite.
CAA - ni izihe mpamyabumenyi abayobozi bemerewe gutanga ibyemezo bya TLS kuri domaine.
SOA - metadata yubuyobozi bwa zone: amazina yibanze, guhuza no gufata igihe.

Kuki ugenzura inyandiko za DNS?

Nyuma yo kwimuka cyangwa guhindura DNS - wemeze inyandiko nshya zibaho kumurongo rusange, ntabwo ari kuri cache ya mudasobwa yawe gusa.
Gutanga imeri - genzura ibyanditswe na SPF / MX nibyo mbere yuko ubutumwa butangira gutaka.
Isubiramo ry'umutekano - reba impinduka zitunguranye TXT / NS, kandi urebe neza ko CAA yanditse urutonde rwa CA gusa.

Inama: Ihinduka rya DNS ntirigaragara ako kanya ahantu hose - buri nyandiko ya TTL ibwira abakemura igihe cyo guhisha igisubizo gishaje. Hasi TTL mbere yimpinduka ziteganijwe, hanyuma uzamure nanone nyuma.

Wabonye aderesi? Reba Indanganturo kuri IP kumurongo wuzuye wo kwakira aderesi, koresha a Kugenzura urutonde kuri yo, cyangwa gusoma Hindura DNS.

FAQ

Ibibazo bya DNS

Umugenzuzi wa DNS ni iki?

Umugenzuzi wa DNS abaza sisitemu yizina rya sisitemu kuri buri bwoko bwanditse bwa domeni - aderesi yerekana (A, AAAA), seriveri zayo (MX), seriveri yizina (NS), imirongo yo kugenzura (TXT) na politiki yumutekano (CAA) - kandi itanga raporo neza nibyo byatangajwe.

Kuki ntashobora kubona CNAME inyandiko kumuzi ya domaine?

DNS ntabwo yemerera CNAME kuri zone apex (urugero.com ubwayo) - umuzi ugomba gukoresha inyandiko za A / AAAA. CNAME inyandiko zigaragara gusa kuri subdomain nka www.urugero.com.

Impinduka za DNS zifata igihe kingana iki kugirango zigaragare?

Buri nyandiko itwara TTL (igihe cyo kubaho) ibwira abakemura igihe cyo kuyifata - kuva kumasegonda kugeza kumunsi. Nyuma yo guhindura inyandiko, abakemuye rubanda bakomeza gutanga igisubizo gishaje kugeza TTL irangiye, bityo kwamamaza birashobora gufata igihe kirekire nka TTL yabanjirije.