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SubFinder is a subdomain discovery tool that uses various techniques to discover massive amounts of subdomains for any target. It has been aimed at a successor to the sublist3r project. SubFinder uses Passive Sources, Search Engines, Pastebin, Internet Archives, etc to find subdomains, and then it uses a permutation module inspired by altdns to generate permutations and resolve them quickly using a powerful bruteforcing engine. It can also perform plain bruteforce if needed. The tool is highly customizable, and the code is built with a modular approach in mind making it easy to add functionalities and remove errors. 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 Changelog v2.5.7 Fixed Docker file to avoid version mismatch by @olearycrew in #771 Added self update option (-update) + version check by @RamanaReddy0M in #780 [hide][Hidden Content]]