Reverse DNS, also known as rDNS, represents the process of resolving an IP address to a domain name. It is the opposite operation of the Forward DNS query. It requires the creation of an additional DNS record, named PTR (pointer) record. Many administrators use it mainly for their email servers in order to prevent spam and provide validation. Read more details about Reverse DNS!
The Dig command is a network administration command-line tool for querying the Domain Name System (DNS). Its full name is actually Domain Information Groper. With it, you can check all kinds of DNS records, check name servers, and perform a Reverse DNS lookup. Therefore, it is very helpful for network troubleshooting. Check out more interesting information about the Dig command!