This tool is build for the finding those subdomains which are waste i.e. the cname of these subdomains no longer exists. This is important since these subdomains may led to various types of attacks such as subdomains takeover, phishing attacks etc.
python and go is essential to run this tool. Also, the executable files will easily work if you are using kali linux as they are build for better performance. Else you can download kali terminal in your system or run it in virtual box.
In order to run this tool write all those domains which you want to test in list.txt file. For eg. facebook.com, google.com etc. Now execute the following command -
./find.sh
It is recommended that you use linux because it has all the dependeciencies present otherwise you might need to insert httpx and massdns in your system.
Please Note this tool uses Massdns for finding the CNAME records as it is more reliable and fast.