How long does it take to propogate a DNS change? Is it instant or does it take 24 to 48 hours? and Why?

Question

some people say instant or in a few minutes. others say 24-48 hours.

Answer 1

It depends on:
. how complicated the DNS structure is
. how it was set up
. how the change was made.

If you have a 1-server DNS then it's almost instant. You make the change, it gets processed into the local DNS files and it's there.

If you have a complex set of masters and slaves, it takes a refresh interval for the change to get down a level... and the refresh interval can be set when the DNS servers are built. Typically these will refresh about once every hour or so... which gives a few hours for the change to ripple out to all of the DNS servers. BUT the person who built it all may have set it to refresh once every day... or once every week... in which case it'll take longer.

BUT just to confuse things, it's possible to mark the DNS information as expired and needing immediate update... so even if it takes a day normally, the person making the change can force it to go out almost instantly.

So people who say 'instant' and peope who say '48 hours' may both be right.

Answer 2

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