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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

DNS over HTTPS (DoH)
A protocol that encrypts DNS queries by sending them over HTTPS, preventing eavesdropping and manipulation of DNS traffic.
Bandwidth
The maximum rate of data transfer across a network connection, measured in bits per second.
QoS (Quality of Service)
A set of techniques for managing network traffic to prioritize certain types of data and ensure performance for critical applications.
CIDR Notation
A compact method for specifying IP addresses and their associated routing prefix using a slash followed by the prefix length.
IP Address
A unique numerical label assigned to each device on a computer network for identification and communication.
IPv6
The latest version of the Internet Protocol with 128-bit addresses, designed to replace IPv4 and solve address exhaustion.
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