What does DNS TTL mean, and when should I change it?

What does DNS TTL mean, and when should I change it?

TTL determines how long a DNS response may be cached before it needs to be requested again. A lower value can help when you are preparing to change your website’s IP address, but it does not make updates immediate everywhere.

Before a move, check the TTL of the records you plan to change and lower it in advance, if your DNS service allows this. The previous value must expire in caches that already hold the record. Once you have checked that the new configuration works, you can return to a value suitable for everyday use. Changing TTL does not move website files or email messages.

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