Which DNS record maps an IP address to a hostname for reverse DNS lookups?

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Multiple Choice

Which DNS record maps an IP address to a hostname for reverse DNS lookups?

Explanation:
Reverse DNS lookups map an IP address back to a hostname, and that mapping is provided by a PTR record. PTR records live in the reverse DNS space (IPv4 uses in-addr.arpa, IPv6 uses ip6.arpa) and link the numeric address to its canonical name, for example 8.8.8.8 → dns.google. By contrast, A records map hostnames to IPv4 addresses, CNAME records create aliases for a name, and NS records specify the authoritative name servers for a zone. So the record type used for IP-to-hostname mappings in reverse lookups is PTR.

Reverse DNS lookups map an IP address back to a hostname, and that mapping is provided by a PTR record. PTR records live in the reverse DNS space (IPv4 uses in-addr.arpa, IPv6 uses ip6.arpa) and link the numeric address to its canonical name, for example 8.8.8.8 → dns.google. By contrast, A records map hostnames to IPv4 addresses, CNAME records create aliases for a name, and NS records specify the authoritative name servers for a zone. So the record type used for IP-to-hostname mappings in reverse lookups is PTR.

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