discovered 30 Mar 2026

sublert

Python ★ 1028 via github-topic

AI Summary: Sublert is a Python-based security tool designed for monitoring new subdomains associated with specific organizations by leveraging certificate transparency. It facilitates automated alerts to a Slack workspace for newly identified subdomains and includes functionalities for DNS resolution to verify active subdomains. Key features include periodic monitoring, configuration options for concurrent threads, and logging capabilities.

README

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                                    Author: Yassine Aboukir
                                        Version: 1.4.7

What’s this about?

Sublert is a security and reconnaissance tool that was written in Python to leverage certificate transparency for the sole purpose of monitoring new subdomains deployed by specific organizations and issued TLS/SSL certificate. The tool is supposed to be scheduled to run periodically at fixed times, dates, or intervals (Ideally each day). New identified subdomains will be sent to Slack workspace with a notification push. Furthermore, the tool performs DNS resolution to determine working subdomains.

Requirements

Virtual Private Server (VPS) running on Unix. (I personally use digitalOcean)
Python 2.x or 3.x.
Free Slack workspace.

Installation & Configuration

Please refer to below article for a detailed technical explanation:

https://medium.com/@yassineaboukir/automated-monitoring-of-subdomains-for-fun-and-profit-release-of-sublert-634cfc5d7708

Usage

Short Form	Long Form	Description
-u	–url	Adds a domain to monitor. E.g: yahoo.com.
-d	–delete	Domain to remove from the monitored list. E.g: yahoo.com.
-a	–list	Listing all monitored domains.
-t	–threads	Number of concurrent threads to use (Default: 20).
-r	–resolve	Perform DNS resolution.
-l	–logging	Enable Slack-based error logging.
-m	–reset	Reset everything.
-q	–question	“yes” or “no” to enable/disable questions asking for input.

Feedback and issues?

If you have any feedback, anything that you want to see implemented or running into issues using Sublert, please feel free to file an issue on https://github.com/yassineaboukir/sublert/issues

Support

If you appreciate my work and wish to support it, feel free to: