fcrdns

Do internet standards require reverse DNS for every device?

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Short Answer Do the standards governing DNS operation require that all devices have a matching PTR record? No. Do the standards for certain protocols require PTR records that agree with corresponding A or AAAA records? Yes. Do some applications not governed by a RFC have the same requirements? Yes. Can a PTR record point at … Read more

Why multiple PTR records in DNS is not recommended?

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The PTR record for a reverse name (eg 7.2.0.192.in-addr.arpa) is expected to identify the canonical name that is associated with that IP address. Both the gateway pointers at network nodes and the normal host pointers at full address nodes use the PTR RR to point back to the primary domain names of the corresponding hosts. … Read more