dnsgrep enumerates DNS information from a domain, attempts zone transfers, and performs a brute force dictionary style attack.
You can download it from the following link: https://packetstormsecurity.com/files/download/43251/dnsgrep-1.16.tgz
Source: https://packetstormsecurity.com/files/43251/dnsgrep-1.16.tgz.html