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Sublert

Sublert is a security and reconnaissance tool which leverages certificate transparency to automatically monitor new subdomains deployed by specific organizations and issued TLS/SSL certificate.

Install / Use

/learn @yassineaboukir/Sublert

README

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                                    Author: Yassine Aboukir
                                        Version: 1.4.7
<p align="center"><a href="https://twitter.com/yassineaboukir" target="_blank"><img src="https://img.shields.io/twitter/follow/yassineaboukir.svg?logo=twitter"></a></p>

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: <a href="http://buymeacoffee.com/yassineaboukir"><img src="https://cdn-images-1.medium.com/max/738/1*G95uyokAH4JC5Ppvx4LmoQ@2x.png" width="150"></a>

Related Skills

View on GitHub
GitHub Stars1.0k
CategoryDevelopment
Updated3d ago
Forks166

Languages

Python

Security Score

100/100

Audited on Apr 1, 2026

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