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Side-by-side breakdowns, no fluff.
DNS (Domain Name System) translates human-readable domain names into IP addresses. Using the correct DNS records is crucial for website uptime and email deliverability.
Points a domain to an IPv4 address. The most fundamental record for hosting.
Controls where your emails are delivered. Misconfigured MX records result in lost emails.
Used for verification (SPF, DKIM, Google Site Verification) and security.
Aliases one domain to another. Commonly used for subdomains (www).
Points a domain to an IPv6 address, the modern counterpart to an A record, which uses IPv4.
Delegates the zone to the authoritative nameservers that hold the real records for the domain.
Holds zone metadata, including the primary nameserver and a serial number that tracks each change to the zone.
Every record carries a TTL, the number of seconds a resolver is allowed to cache it before fetching a fresh copy. When you edit a record, existing resolvers keep serving the old value until their cached copy expires, so a change only appears everywhere once the previous TTL has elapsed across every resolver. Lowering the TTL ahead of a planned change speeds up how quickly the update spreads.
Up to the record's TTL. A resolver keeps serving the old value until its cached copy expires, so a change can appear within minutes or take as long as 48 hours across every resolver.
Time to live, the number of seconds a resolver is allowed to cache a record before fetching it again. A low TTL means changes spread quickly; a high TTL reduces query load but slows updates.
An A record maps a name straight to an IPv4 address. A CNAME maps one name to another name, letting the target's records resolve the final address. A CNAME cannot coexist with other records on the same name.
It delegates a zone to its authoritative nameservers, telling resolvers which servers hold the real records for the domain.