Reverse DNS (rDNS) is essential to the Domain Name System (DNS). While a forward DNS query uses an IP address to find the domain name of a specific website, rDNS does the opposite—it translates a domain name into its associated IP address. This helps validate an email address and ensures that the domain name’s owner is hosting an email server or a website. It is also essential for Internet Service Providers (ISP) to maintain a consistent history of WHOIS records, which provide details such as the contact name, address, and phone number associated with a domain name. rDNS is a key step toward ensuring the security of websites, email servers, and end users. Learn more details about rDNS.