subfinder -> you can install it on Kali linux with :
sudo apt update
sudo apt install subfinder
This is a tool i made using C++, for learning purposes only, it relies on the subfinder tool to get a list of subdomains, and tries to ping them one by one, you will find the working subdomains in a file. use -h to display the help message
compilation :
c++ subfinder-checker.cpp -o subfinder-checker
Usage :
Help Message :
Command Example :
domains_result.txt file: