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How often do ISPs update their DNS Caches?

April 26, 2017caches DNS ISP

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How often do ISPs update their DNS Caches?

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Every ISP (Internet service provider) and web hosting company operates a Domain Name Service. The DNS server translates the Domain Name into a numerical value that the computers on the Internet recognize. The DNS server saves or caches previous translations so that later requests can be handled much more quickly (the name server reads the stored information and does not have to perform a translation/search each time the name is resolved). The cache of every DNS server is deleted periodically. The length of time between purges is different for everyone though most hosts/ISPs clear DNS cache every 7 to 10 days (some more frequently some less frequently). This means that if your domain is moved or transferred it may take up to 10 days for everyone on the Internet to see the changes.