Knockpy is a python tool. It is designed to enumerate subdomains on a target domain through a wordlist. It is designed to scan for DNS zone transfer and to try to bypass the wildcard DNS record automatically if it is enabled. Now knockpy supports queries to VirusTotal subdomains, you can set the API_KEY within the config.json file.
This tool is running on Python 2.7 version.
$ sudo apt-get install python-dnspython
OR Download using below commands
How to Install knock
$ git clone https://github.com/guelfoweb/knock.git $ cd knock $ nano knockpy/config.json <- set your virustotal API_KEY $ sudo python setup.py install