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What does the Time To Live (TTL) for a DNS record mean?

April 26, 2017DNS live mean record time TTL

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What does the Time To Live (TTL) for a DNS record mean?

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The TTL tells a DNS server how long it is allowed to cache a DNS record. Caching is a standard feature in the DNS. When one DNS server queries another DNS server for a record, it is allowed to store the answer in its local memory cache for the number of seconds specified by the TTL value. Only after the TTL has expired will the caching server repeat the query to get a fresh copy of the DNS record from the authoritative server. For domains hosted on AT&T DNS servers, DNS records that do not have an explicit TTL are given a default TTL value of 86,400 seconds (24 hours). So if you change an existing DNS record through DPT, it may take up to 24 hours after the change is downloaded for the new value to propagate to all other DNS servers on the Internet.