Firefox Browser Add-ons
Log in
Preview of Subdomain Finder

Subdomain Finder by Sumalya Chatterjee

Enumerates subdomains, directories, shows website IP, and checks for robots.txt

5 (1 reviews)5 (1 reviews)
58 Users58 Users
You'll need Firefox to use this extension
Download Firefox
Download file

Extension Metadata

Screenshots
Subdomain finder directory scansubdomain scan
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:

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
"Subdomain Finder: Where Code Meets Curiosity!"

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.
Rated 5 by 1 reviewer
Log in to rate this extension
There are no ratings yet

Star rating saved

5
1
4
0
3
0
2
0
1
0
Read 1 review
Permissions and dataLearn more

Required permissions:

  • Access browser tabs

Optional permissions:

  • Access your data for all websites
More information
Add-on Links
  • Support Email
Version
2.0.1
Size
38.07 KB
Last updated
5 months ago (Mar 8, 2025)
Related Categories
  • Web Development
  • Privacy & Security
  • Tabs
License
GNU Lesser General Public License v3.0 only
Version History
  • See all versions
Add to collection
Report this add-on
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

Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Browsers

  • Desktop
  • Mobile
  • Enterprise

Products

  • Browsers
  • VPN
  • Relay
  • Monitor
  • Pocket
  • Bluesky (@firefox.com)
  • Instagram (Firefox)
  • YouTube (firefoxchannel)
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.