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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.

Related Terms

MTU (Maximum Transmission Unit)
The maximum size of a data packet that can be transmitted over a network without fragmentation.
DNS (Domain Name System)
A hierarchical naming system that translates human-readable domain names into IP addresses.
HTTP Keep-Alive
An HTTP mechanism that reuses a single TCP connection for multiple requests, reducing the overhead of establishing new connections.
IP Address
A unique numerical label assigned to each device on a computer network for identification and communication.
SSL/TLS Certificate
A digital certificate that authenticates a website identity and enables encrypted HTTPS connections.
Multicast
A network communication method that sends data to multiple recipients simultaneously without duplicating packets for each recipient.
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