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What is a reverse DNS lookup?
The resolution from a domain name to the associated IP Address
The resolution from IP Address to the associated domain name
When a DNS Server sends query packets to hosts
When a DNS Server responds to query packets by hosts
Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name associated with an IP address via querying DNS - the reverse of the usual "forward" DNS lookup of an IP from a domain name. The process of reverse resolving an IP address uses the pointer DNS record type (PTR record). https://en.wikipedia.org/wiki/ReverseDNSlookup
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