
Subdomain Finder by Sumalya Chatterjee
Enumerates subdomains, directories, shows website IP, and checks for robots.txt
You'll need Firefox to use this extension
Extension Metadata
Screenshots


About this extension
Unleash the Power of Discovery with Subdomain Finder!
Dive deep into the web's hidden layers with Subdomain Finder, the ultimate tool for developers, security enthusiasts, and curious minds. This sleek, feature-packed Firefox extension lets you uncover subdomains, scan directories, check for robots.txt, and fetch IP addresses—all in one place.
🔍 Key Features:
Whether you're a penetration tester, web developer, or just exploring the web's architecture, Subdomain Finder is your go-to tool for uncovering the hidden gems of any website.
Install now and start exploring the web like never before! 🌐
Dive deep into the web's hidden layers with Subdomain Finder, the ultimate tool for developers, security enthusiasts, and curious minds. This sleek, feature-packed Firefox extension lets you uncover subdomains, scan directories, check for robots.txt, and fetch IP addresses—all in one place.
🔍 Key Features:
Subdomain Enumeration: Discover hidden subdomains with multiple detection methods, including DNS lookups, SSL certificate analysis, and more.
Directory Scanning: Find exposed directories and endpoints with a powerful directory scanner.
Robots.txt Checker: Instantly check for and analyze robots.txt files to understand website crawling rules.
IP Lookup: Quickly retrieve the IP address of any domain.
History & Cache: Save and revisit your findings with a built-in history feature.
Sleek Glassmorphism UI: Enjoy a modern, dark-themed interface with smooth animations and intuitive controls.
Whether you're a penetration tester, web developer, or just exploring the web's architecture, Subdomain Finder is your go-to tool for uncovering the hidden gems of any website.
Install now and start exploring the web like never before! 🌐
Developer comments
Rate your experience
PermissionsLearn more
This add-on needs to:
- Access browser tabs
This add-on may also ask to:
- Access your data for all websites
More information
- Add-on Links
- Version
- 2.0.1
- Size
- 38.07 KB
- Last updated
- a month ago (Mar 8, 2025)
- Related Categories
- License
- GNU Lesser General Public License v3.0 only
- Version History
Add to collection
Release notes for 2.0.1
Adding thank you webpage
More extensions by Sumalya Chatterjee
- There are no ratings yet
- There are no ratings yet
- There are no ratings yet
- There are no ratings yet
- There are no ratings yet
- There are no ratings yet
As a developer, I’ve always been fascinated by the hidden layers of the web—those subdomains, directories, and endpoints that often go unnoticed. With Subdomain Finder, I set out to create a tool that not only uncovers these hidden gems but does so with elegance and efficiency.
This extension is a blend of modern web technologies, from DNS lookups and SSL certificate parsing to directory scanning and robots.txt analysis. Built with a sleek glassmorphism UI, it’s designed to be as visually appealing as it is powerful.
What excites me most is the multi-method approach to subdomain discovery—combining DNS queries, certificate data, and even HTML source analysis to ensure no stone is left unturned. The directory scanner is equally robust, with support for common paths and sitemap integration, making it a must-have for penetration testers and web developers alike.
But beyond the technical prowess, this project was a labor of love—a chance to explore the web’s architecture and share that curiosity with others. Whether you're debugging, securing a site, or just geeking out over domain structures, Subdomain Finder is here to make your journey smoother and more stylish.
Feel free to fork, tweak, or contribute. After all, the best code is the kind that sparks curiosity and inspires others to build! 🚀
— Crafted with ❤️ and a dash of JavaScript magic.