Also called time to live
TTL, explained
Every DNS record carries a TTL set by whoever hosts the zone. Values commonly range from a few minutes to a day, and one hour, 3600 seconds, is a typical default. A long TTL means fewer lookups and steadier performance; a short one means changes spread sooner. Nameserver changes follow a separate path: the delegation records in the TLD's own zone carry their own TTL, set by the registry, which is one reason a nameserver switch can take hours or a day or two to settle everywhere.
For a domain investor, TTL matters whenever you move names in bulk or hand one to a buyer. Lower the TTL on records you plan to change a day ahead, make the change, then raise it again. When a buyer reports that a domain still shows your old lander after a transfer, cached records are the usual cause, not a failed transfer, so check from several networks or a public DNS lookup tool before escalating.
Example. Setting a record's TTL to 300 seconds lets resolvers cache it for up to five minutes before they must fetch it again.
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