Subfinder - a subdomain discovery tool, discovers valid subdomains

subfinder is a subdomain discovery tool that discovers valid subdomains for websites by 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 designed subfinder to comply with all passive sources licenses, and usage restrictions, as well as maintained a consistently passive model to make it useful to both penetration testers and bug bounty hunters alike.

Features

Simple and modular code base making it easy to contribute.
Fast And Powerful Resolution and wildcard elimination module
Curated passive sources to maximize results (26 Sources as of now)
Multiple Output formats supported (Json, File, Stdout)
Optimized for speed, very fast and lightweight on resources
Stdin and stdout support for integrating in workflows

Usage

subfinder -h

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

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Author

Hakin9 TEAM: Hakin9 is a monthly magazine dedicated to hacking and cybersecurity. In every edition, we try to focus on different approaches to show various techniques - defensive and offensive. This knowledge will help you understand how most popular attacks are performed and how to protect your data from them. Our tutorials, case studies and online courses will prepare you for the upcoming, potential threats in the cyber security world. We collaborate with many individuals and universities and public institutions, but also with companies such as Xento Systems, CATO Networks, EY, CIPHER Intelligence LAB, redBorder, TSG, and others.