Enumerating DNS using the dnsenum command

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.