Domain Name System
DNS translates names such as www.example.com into the addresses and service records computers need. It is a distributed directory: registries delegate nameservers, authoritative servers publish records and resolvers cache answers.
Human-readable namesConnect to technical records.
Distributed systemNo single DNS database.
Answers are cachedTTL affects change timing.
A lookup
Your device asks a recursive resolver. If the answer is not cached, it follows referrals from the root to the top-level domain and then to the domain's authoritative nameservers, which return the requested record.
Record types
A and AAAA records route hosts to IP addresses, CNAME creates an alias, MX selects incoming mail servers and TXT publishes verification or policy text. Changing one record does not automatically move every service.
After a change
The authoritative zone updates after a successful save, but resolvers may continue returning an earlier answer. Check the exact hostname and record type, and edit records at the provider whose nameservers are authoritative.
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