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fcrdns Tag

Forward-confirmed reverse DNS (FCrDNS) is an rDNS configuration that defines strong relationship between IP and domain. FCrDNS implementation depends on a joint action between the IP administrator and the domain administrator. When FCrDNS is valid, there is a guarantee that the domain owner has responsibility for the use of IP.   How to check FCrDNS for IPv4   To check the FCrDNS, you must query the rDNS. As an...

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