Reducing TTL in the .cz zone

DNS records contain a lot of important data, including the information on how quickly such data becomes obsolete, the so-called TTL (Time To Live). TTL in the DNS indicates for how long the data can be stored on a recursive nameserver (resolver) without it being retrieved from an authoritative nameserver. The lower the TTL, the more frequently resolvers query authoritative nameservers and obtain the most recent data. At the same time, however, a short TTL causes heavier load on nameservers, and if DNS records do not change often, the TTL is usually set to several hours.

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