Which DNS record is used for reverse DNS lookups, mapping an IP address back to a domain name?

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Multiple Choice

Which DNS record is used for reverse DNS lookups, mapping an IP address back to a domain name?

Explanation:
PTR records are used for reverse DNS lookups, translating an IP address back into a domain name. In this scheme, the IP address is represented in a special in-addr.arpa (for IPv4) or ip6.arpa (for IPv6) domain, and a PTR record in that zone points to the corresponding hostname. This is different from forward mapping, where A records map a domain to an IPv4 address (and AAAA maps to IPv6). Other record types serve different purposes: MX specifies mail exchangers for a domain, and NS designates the authoritative name servers for the domain.

PTR records are used for reverse DNS lookups, translating an IP address back into a domain name. In this scheme, the IP address is represented in a special in-addr.arpa (for IPv4) or ip6.arpa (for IPv6) domain, and a PTR record in that zone points to the corresponding hostname. This is different from forward mapping, where A records map a domain to an IPv4 address (and AAAA maps to IPv6). Other record types serve different purposes: MX specifies mail exchangers for a domain, and NS designates the authoritative name servers for the domain.

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