Forward-confirmed reverse DNS

Forward-confirmed reverse DNS (FCrDNS), also known as full-circle reverse DNS, double-reverse DNS, or iprev, is a networking parameter configuration in which a given IP address has both forward (name-to-address) and reverse (address-to-name) Domain Name System (DNS) entries that match each other. This is the standard configuration expected by the Internet standards supporting many DNS -reliant protocols.

Source: Wikipedia — Forward-confirmed reverse DNS (CC BY-SA 4.0)

Forward-confirmed reverse DNS

Forward-confirmed reverse DNS (FCrDNS), also known as full-circle reverse DNS, double-reverse DNS, or iprev, is a networking parameter configuration in which a given IP address has both forward (name-to-address) and reverse (address-to-name) Domain Name System (DNS) entries that match each other. This is the standard configuration expected by the Internet standards supporting many DNS -reliant protocols.

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Source: Wikipedia "Forward-confirmed reverse DNS" · CC BY-SA 4.0

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