Mass resolve 100k domains in less than 5 minutes, report non-existent ones.

The purpose of this script was to go through the list of every domain found in outbound smtp logs and find those non-existent and therefore ready to be registered by an adversary in order to collect mistakenly addressed emails.

• Python >= 3.7 (3.8 is recommended)
• libs from requirements.txt

clone this repo
python3 -m pip install -r requirements.txt

python3 main.py process --nameservers 1.1.1.1,8.8.8.8 --workers_num 5 list.csv

Will spawn 10 asynchronous tasks (5 for 1.1.1.1 and 5 for 8.8.8.8) and resolve domains read from list.csv file. Non-existent domains will be written to report.csv.

Example list.csv:

domain;popularity
example.org;1
e-xample.org;5
example.cn;3
e-x-ple.com;1

(Note: popularity column is mandatory, but values are irrelevant and won't affect script's behaviour). Its only purpose is to indicate subjective popularity of the domain. This is useful if you take a list of domains from http or smtp logs and know exactly how popular it is within your environment.