Who is Subdomain Finder for?

Subdomain Finder is a B2B product built for developers and security enthusiasts.

Is Subdomain Finder free?

Yes — Subdomain Finder is free to use.

What platforms does Subdomain Finder run on?

Subdomain Finder runs on the web, embeddable surfaces, and Android.

Is Subdomain Finder still maintained?

Unverified. Subdomain Finder has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to Subdomain Finder?

Similar projects tracked by PulseGate include Subtitle Finder, Reddit Submission Finder, and Domain Details.

Who makes Subdomain Finder?

Subdomain Finder is developed by Sumalya Chatterjee.

How long has Subdomain Finder been around?

Subdomain Finder first shipped in 2025.

Back to the index

Subdomain Finder

Name: Subdomain Finder
Author: Sumalya Chatterjee

mozilla.orgBrowser DevTools & extensions

Subdomain Finder is a Firefox extension that enumerates subdomains using DNS and SSL certificate methods, scans directories and endpoints, checks robots.txt files, and retrieves domain IP addresses. It also provides history and cache features for developers and security enthusiasts.

FreeWebEmbeddableAndroid

Visit mozilla.org

Overview

8 features

In the Browser DevTools & extensions space, Subdomain Finder takes a focused approach. It focuses on discovering a website's subdomains, directories, robots.txt rules, and IP address from one browser extension. Subdomain Finder is a B2B product aimed at developers and security enthusiasts. It is available for free. It ships for the web, embeddable surfaces, and Android.

Behind Subdomain Finder is Sumalya Chatterjee, and it first shipped in 2025. Among its 8 catalogued features are Subdomain Enumeration, Directory Scanning, and Robots.txt Checker. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Subdomain Enumeration
Directory Scanning
Robots.txt Checker
IP Lookup
DNS Lookups
SSL Analysis
History And Cache
Firefox Android Support

Built with & integrations

Runs on

BrowserEmbeddableAndroid

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed11 Sep · 22:39 UTC
Subdomain Finder verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Subdomain Finder

What is Subdomain Finder?: Subdomain Finder focuses on discovering a website's subdomains, directories, robots.txt rules, and IP address from one browser extension. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Subdomain Finder for?: Subdomain Finder is a B2B product built for developers and security enthusiasts.
Is Subdomain Finder free?: Yes — Subdomain Finder is free to use.
What platforms does Subdomain Finder run on?: Subdomain Finder runs on the web, embeddable surfaces, and Android.
Is Subdomain Finder still maintained?: Unverified. Subdomain Finder has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to Subdomain Finder?: Similar projects tracked by PulseGate include Subtitle Finder, Reddit Submission Finder, and Domain Details.Subtitle Finder Reddit Submission Finder Domain Details
Who makes Subdomain Finder?: Subdomain Finder is developed by Sumalya Chatterjee.
How long has Subdomain Finder been around?: Subdomain Finder first shipped in 2025.

At a glance

Pricing: Free
Platforms: Web
Built for: developers and security enthusiasts
Model: B2B
Solves: Discovering a website's subdomains, directories, robots.txt rules, and IP address from one browser extension.

Registered as

Firefox Add-ons: subdomain-finder

Developer

Sumalya Chatterjee

Index record

Indexed: 11 Sep 2026
Lifecycle: Alive
Last seen: 11 Sep 2026

Identity audit (13)

Slug: subdomain-finder-mozilla-org
Lifecycle state recorded: 11 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 11 Sep 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 11 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/subdomain-finder

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