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Networking Beginner

What is DNS Propagation?

The time it takes for DNS record changes to spread across all DNS servers worldwide, typically taking up to 48 hours.

When DNS records are updated, the changes must propagate through the global DNS system. Each DNS server caches records for the duration of their TTL (Time To Live). Until the old cached records expire, some users may see old values.

Propagation time depends on the TTL value — lower TTL means faster propagation but more DNS queries. Before making critical changes, reduce TTL in advance. Tools like whatsmydns.org check propagation status globally.

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