DNS TTL Calculator

What is TTL?

TTL or Time To Live in DNS is a numerical value set in a DNS record on the authoritative domain name server for de domain.

It defines the number of seconds that a cache server can provide its cached value for the record. When the defined number of seconds have passed since the last refresh, the caching server will reach out to the authoritative server again and receive the current -- and possibly changed -- value for the record.

Definition taken from techtarget.com