Reverse DNS (RDNS) is a Domain Name System (DNS) query that maps an IP address to its corresponding domain name, essentially performing the reverse of a standard DNS lookup.
Checking RDNS is crucial for various reasons. It aids in identifying the true source of emails, mitigating spam and phishing attempts by verifying that the sender’s IP address aligns with their claimed domain name. Moreover, RDNS assists in troubleshooting network issues by helping to pinpoint the origin of a connection.
