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What is DNS?
The Domain Name System (DNS) helps computers find services by using human-readable domain names. When you enter a domain in a browser, DNS helps locate the server associated with that name.
How a DNS lookup works
Your device usually asks a recursive DNS resolver for the answer. If the answer is not cached, the resolver follows the DNS hierarchy until it can return the relevant record. Results may be cached, so changes are not always visible immediately.
Nameservers and DNS records
Nameservers host the authoritative DNS information for a domain. DNS records provide specific instructions, such as which server handles a website or where email should be delivered. Common record types include A, AAAA, CNAME, MX and TXT.
Where do you manage DNS?
DNS is usually managed wherever the domain's authoritative nameservers point. This may be your domain registrar, hosting provider, or a dedicated DNS service. Changing nameservers can move control of the DNS zone to another provider.
Why can changes take time?
Resolvers cache DNS answers according to their time-to-live (TTL) values. After a change, some users may see the new answer while others still receive a cached one. Plan important changes in advance and verify records carefully.
