Findomain is an open source reconnaissance tool designed to discover and enumerate subdomains associated with a target domain. It focuses on speed and reliability by using Certificate Transparency logs and multiple well tested public APIs instead of relying solely on brute force scanning techniques. By querying multiple passive data sources in parallel, the tool can identify a large number of subdomains within a short time, making it useful for security researchers, penetration testers, and bug bounty hunters. Findomain aggregates information from various online services to provide a comprehensive list of discovered subdomains without directly attacking the target infrastructure. The tool also supports monitoring capabilities that allow users to track newly discovered subdomains and send alerts through integrations such as messaging platforms. Written in Rust, Findomain benefits from strong performance, safe concurrency, and cross platform compatibility.

Features

  • Subdomain discovery using Certificate Transparency logs and multiple APIs
  • Multi threaded API querying for faster reconnaissance results
  • Parallel subdomain resolution with high performance DNS lookups
  • Subdomain monitoring with alerts via Discord, Slack, or Telegram
  • Support for importing and working with data from other reconnaissance tools
  • Configurable output formats and options to show resolved subdomains or IP addresses

Project Samples

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Categories

OSINT

License

GNU General Public License version 3.0 (GPLv3)

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Additional Project Details

Programming Language

Rust

Related Categories

Rust OSINT Tool

Registered

2026-03-06