VocabScan v1.0 (dig version) scans just .com and outputs to result.txt. Takes the hosts from a wordlist, so be sure between IPs there are not undesired domains.
You can download it from the following link: https://packetstormsecurity.com/files/download/24690/vocabind-1.c
Source: https://packetstormsecurity.com/files/24690/vocabind-1.c.html