subfinder

Open source

Fast passive subdomain enumeration tool.

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About

Fast passive subdomain enumeration tool.

Features • Install • Usage • API Setup • Library • Join Discord

subfinder is a subdomain discovery tool that returns valid subdomains for websites, using passive online sources. It has a simple, modular architecture and is optimized for speed. subfinder is built for doing one thing only - passive subdomain enumeration, and it does that very well.

We have made it to comply with all the used passive source licenses and usage restrictions. The passive model guarantees speed and stealthiness that can be leveraged by both penetration testers and bug bounty hunters alike.

Features

Fast and powerful resolution and wildcard elimination modules
Curated passive sources to maximize results
Multiple output formats supported (JSON, file, stdout)
Optimized for speed and lightweight on resources
STDIN/OUT support enables easy integration into workflows

Usage

bash

subfinder -h

This will display help for the tool. Here are all the switches it supports.

…

Environment Variables

Subfinder supports environment variables to specify custom paths for configuration files:

SUBFINDER_CONFIG - Path to config.yaml file (overrides default $CONFIG/subfinder/config.yaml)
SUBFINDER_PROVIDER_CONFIG - Path to provider-config.yaml file (overrides default $CONFIG/subfinder/provider-config.yaml)

Installation

subfinder requires go1.24 to install successfully. Run the following command to install the latest version:

bash

go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest

Learn about more ways to install subfinder here: https://docs.projectdiscovery.io/tools/subfinder/install.

Post Installation Instructions

subfinder can be used right after the installation, however many sources required API keys to work. Learn more here: https://docs.projectdiscovery.io/tools/subfinder/install#post-install-configuration.

Running Subfinder

Learn about how to run Subfinder here: https://docs.projectdiscovery.io/tools/subfinder/running.

Subfinder Go library

Subfinder can also be used as library and a minimal examples of using subfinder SDK is available here

Resources

Recon with Me !!!

License

subfinder is made with 🖤 by the projectdiscovery team. Community contributions have made the project what it is. See the THANKS.md file for more details.

Read the usage disclaimer at DISCLAIMER.md and contact us for any API removal.