Knowledgebase: DNS
What is a TTL?
Posted by Darren Radsmith on 16 May 2004 07:04 PM

The TTL (time to live) is the amount of time that your record will cache in remote systems / resolving name servers. So the longer the TTL the less frequent remote systems will lookup your DNS record and the less query traffic you receive. The shorter the configured TTL, the faster DNS changes propagate in servers that have cache data, however the higher the volume of query traffic you receive.

DNS Made Easy suggests all records that are using DNS Failover or assigned to Dynamic IP's have TTL's set anywhere from 180 to 600 (3 to 10 minutes cache). Records that are static and don't change often should have TTL's set between 1800 (being on the low end) to 86400 seconds (30 minutes to 1 day cache). Any added NS records or glue records for vanity DNS configuration should have high TTL's set. You can always lower the TTL before you make a record change and then raise it back up again.

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