tool to enumerate domain DNS information

 Dnsenum is a multithreaded perl script to enumerate DNS information of a
 domain and to discover non-contiguous ip blocks. The main purpose of Dnsenum
 is to gather as much information as possible about a domain. The program
 currently performs the following operations:
 .
   - Get the host's addresses (A record).
   - Get the namservers (threaded).
   - Get the MX record (threaded).
   - Perform axfr queries on nameservers and get BIND versions(threaded).
   - Get extra names and subdomains via google scraping (google query =
     "allinurl: -www site:domain").
   - Brute force subdomains from file, can also perform recursion on subdomain
     that have NS records (all threaded).
   - Calculate C class domain network ranges and perform whois queries on them
     (threaded).
   - Perform reverse lookups on netranges (C class or/and whois netranges)
     (threaded).
   - Write to domain_ips.txt file ip-blocks.
 .
 This program is useful for pentesters, ethical hackers and forensics experts.
 It also can be used for security tests.