TTL, or time to live, is how long DNS answers may be cached before being looked up again.
It is set in seconds on each record. A TTL of 3600 means one hour. A long TTL means slower changes but less lookup traffic.
Before a launch, lower the TTL on the records you plan to change a day ahead. Then the switch takes minutes instead of a day.
Our go-live checklist includes lowering TTL early and raising it again after the site is stable on your domain.
Propagation is the wait while DNS servers around the world pick up a record change.
DNS is the phone book that turns your domain name into the address of the server that holds your site.
An A record points your domain name to the numeric address of a server.
A cache is a saved copy of something so it does not need to be fetched or built again.
Find out in about a minute. Free, no sign-in, every line a measurement — then see your site reinvented. The Think Bright System does the work; a person reviews before go-live.
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