What is DNS propagation and why does it take so long?

facha

Administrator
Staff member
'DNS propagation' is a term used to describe the time frame after making any changes to your domain name.

Every time you use a domain name on your computer its DNS information will be stored in a cache. This can be local cache on your computer's operating system, DNS cache stored by your Internet service provider, etc.

DNS records are stored in cache mainly to improve the performance of DNS queries. Every DNS record has a Time to Live (TTL) value, which is the time DNS servers should store that record in cache. Even if a record is changed, DNS servers will continue working with its formal value from cache until this time has passed.

This is the essence of DNS propagation - it is the time required for DNS servers worldwide to update their cached information for a domain name. It is influenced by the TTL of DNS records that might have changed, but there are also other factors that could come into play.

A DNS change requires up to 72 hours to propagate worldwide, although most often this happens in a matter of hours.

Flushing your own local DNS cache can help speed up the process.
 
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