Glossary
What is TTL?
Specifies in seconds how long a DNS record may be cached.
For a DNS record, TTL specifies in seconds how long a resolver may cache an answer. Lowering TTL before a planned move can be useful, but previously cached answers do not immediately inherit the new lifetime. After a change, compare both record values and measurement times across resolvers.
Example
A TTL of 3600 seconds represents a one-hour cache lifetime. The remaining lifetime of an earlier answer can differ from a newly published TTL.
Common issue
The displayed TTL is not a shared countdown or a guaranteed propagation deadline for the whole internet. Lowering it later does not instantly clear existing caches.