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Former site still visible and new site unattainable after a DNS change
A tool is at your disposal ; it enables you to visualize in broad outline the evolution of the DNS spreading. If the list doesn't mention both our DNS everywhere, then the spreading isn't yet over. If it shows both our DNS everywhere, then we may assume that the spreading is coming to an end. But of course this list isn't exhaustive... so please be patient...
Link to this FAQ: