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CTFR – Get Subdomain in Kali Linux

Last Updated : 06 Jun, 2021
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CTFR is a free and open-source tool available on GitHub. This tool is free, which means you can download and use this tool for free of cost.  CTFR is used for reconnaissance of subdomains, information gathering of the target, finding subdomains from an HTTPS website. Usually what happens is that it becomes very difficult for a security researcher to find subdomains from an HTTPS website or web application, and this tool helps to get subdomains from all HTTPS websites. 

 ctfr tool is written in python, so you must have python installed in your Kali Linux in order to use this tool. This tool comes with an awesome user interface. 

ctfr tool

Features and uses of ctfr:

  • ctfr is a free and open-source tool available on GitHub.
  • ctfr is written in  Python .
  • ctfr tool is used for reconnaissance of subdomains of HTTPS websites.
  • ctfr tool is used for information gathering.
  • ctfr tool is used to find subdomains of the target.

Installation and step by step tutorial of ctfr:


To install the tool, first move to the desktop and then install the tool using the following commands.

cd Desktop

git clone

Step 2:

The tool has been downloaded onto your machine. Now move to the directory of the tool and use the following command to install requirements.

cd ctfr

pip3 install -r requirements.txt

Step 3:

Now all the requirements have been downloaded. To run the tool, use the following command.


This is ctfr tool. Now we will see how to use this tool with examples.

Example :

 Use ctfr tool to find subdomains of a HTTPS website which is

python3 -d

We have run the command to scan for

You can see the tool has given us so many subdomains of This is how you can also scan the website of your domain. 

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