What Exactly Is Reverse DNS and How Does It Work?

Reverse DNS is a method used to determine the domain name associated with an IP address. This is the opposite of forward DNS, which translates domain names into IP addresses.

So how does reverse DNS work?
Here's a brief overview:

A client computer sends a request for a web page to a server.

The server receives the request and sends a response back to the client.
The response includes the IP address of the server.
The client's computer uses reverse DNS to translate the IP address into a domain name.
There are several reasons why reverse DNS is used, such as improving the performance of network communication, verifying the identity of servers, and filtering email based on the domain name of the sender's server.



Reverse DNS is implemented using a special type of DNS record called a "pointer" (PTR) record. This record maps an IP address to a domain name. When a client computer performs a reverse DNS lookup, it sends a request to the DNS server responsible for the IP address's subnet, asking for the PTR record associated with the IP address. If a PTR record exists, the DNS server returns the domain name to the client. If no PTR record exists, the DNS server returns an error message.
Here are a few online reverse DNS tools :
https://dns.google.com/
https://mxtoolbox.com/ReverseLookup.aspx
https://www.whatismyip.com/reverse-dn...
https://hackertarget.com/reverse-dns-...
https://whatismyipaddress.com/ip-host...