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FierceSubfinder
Free

Free and open source under the GPL-3.0 license.

 Free

The open-source software is available without a license fee. Hosting, hardware and…

Command line Windows, macOS, Linux, Command line
  • Finds hostnames and related IP space through DNS reconnaissance
  • Can traverse nearby IP addresses
  • Combines results from multiple discovery services.
  • Intended for authorized testing
  • Command-line interface only
  • Some data sources require API credentials or impose limits.
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0 License: MIT
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 8, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.