Reverse DNS (rDNS) is a method of resolving an IP address back to a domain name, the opposite of the more commonly known forward DNS, which converts domain names to IP addresses. This process is used to verify that the IP address is associated with the domain it claims to be from, enhancing security and trustworthiness. In web hosting, reverse DNS is crucial for services like email servers, where it helps to reduce spam by verifying sender authenticity.
