Why do people always tell me that my DNS changes take 24-48 hours to propagate?

Every domain has two name servers assigned to it and these are the only two name servers that hold records for the domain. However, when another server somewhere else in the world, queries the name servers for DNS records, it will often keep a local copy of the DNS record so that next time it needs to know what IP address the domain resolves to, it already has the answer.

Once changes are made to the actual DNS records on the two name servers that are assigned to your domain, these changes will gradually filter through the other servers in the world so that everything is up to date and it is this process that normally takes 24-48 hours.

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