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DNSRecon vs Fierce: catalog facts
DNSRecon	Fierce
Free Free and open source.	Free Free and open source under the GPL-3.0 license.
Windows, macOS, Linux, Command line	Command line
Covers record lookups, zone transfer tests and subdomain brute-forcing Can run in Docker	Finds hostnames and related IP space through DNS reconnaissance Can traverse nearby IP addresses
Intended for authorized testing only Command-line only with no graphical interface	Intended for authorized testing Command-line interface only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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