Similar to dnsrecon, dnsenum is a tool used for enumerating DNS information. The dnsenum script is a multithreaded Perl script written by Filip Waeytens for conducting DNS reconnaissance. It can be used to enumerate DNS information of a domain in order to find non-contiguous IP blocks. It not only helps discover non-contiguous IP blocks, but also provides several other types of information, such as the A record of the host's address, threaded nameservers, threaded MX record, and threaded bind version.
Enumerating DNS using the dnsenum command
Getting ready
The dnsenum script comes preinstalled on Kali Linux. If you are using a different Linux/Unix distribution, it can be downloaded and installed from https://github.com/fwaeytens/dnsenum.