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....