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Sublert – Security & Reconnaissance Tool Which Leverages Certificate Transparency

  • Last Updated : 24 Oct, 2021

Sublert tool is an automated tool that is used to monitor the newly identified subdomains for the parent domains which are deployed by specific organizations and issued TLS/SSL certificates. Sublert tool is developed in the Python Language and is also available on the GitHub platform. Sublert tool is free and open-source to use. So you can also contribute to the development of the tool. Sublert tool is been supposed to be scheduled to run frequently at some fixed time, dates, or each day. This tool also performs DNS resolution on the subdomains.

Note: Make Sure You have Python Installed on your System, as this is a python-based tool. Click to check the Installation process: Python Installation Steps on Linux

Installation of Sublert Tool on Kali Linux OS

Step 1: Use the following command to install the tool in your Kali Linux operating system.

git clone

Step 2: Now use the following command to move into the directory of the tool. You have to move in the directory in order to run the tool.

cd sublert

Step 3: You are in the directory of the Sublert. Now you have to install a dependency of the Sublert using the following command.

sudo pip3 install -r requirements.txt 

Step 4: All the dependencies have been installed in your Kali Linux operating system. Now use the following command to run the tool and check the help section.

python3  -h

Working with Sublert Tool on Kali Linux OS

Example 1: Domain to monitor

python3 -u

In this example, we are adding for monitoring.

We have got the list of subdomains associated with the parent domain

Example 2: Domain to remove from the monitored list

python3 -d

In this example, we are removing the domain from the monitored list.

Example 3: Number of concurrent threads to use

python3 -u -t 20

In this example, we are specifying the thread’s value for faster execution

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