When a website’s domain settings are changed (for example, pointing the domain to a new server), the update doesn’t appear everywhere on the internet instantly. The process of those changes spreading across the global network is called

The internet relies on thousands of DNS servers around the world. These servers act like address books that tell browsers where a website lives.

When a change is made:

  1. The domain’s authoritative DNS server is updated first.

  2. Internet providers and DNS servers around the world gradually refresh their cached records.

  3. As each server updates, users in those locations begin seeing the new site.

Because every provider refreshes its cache at different times, some people may see the old website while others already see the new one.

How Long It Takes

Most DNS changes complete within a few minutes to a few hours, but it can take up to 24–48 hours for every network worldwide to update.

What Clients May Notice

During propagation, it’s normal to see things like:

  • The website working for some people but not others

  • Email briefly routing to the old server

  • The site appearing to “switch” between old and new versions

This is temporary and resolves automatically as the DNS records update globally.

Simple Analogy

Think of DNS like updating a phone number in phone books around the world.
Even after you change the number, it takes time for every phone book to print the new one.