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MassDNS vs DNSGen: catalog facts
MassDNS	DNSGen
Best for: Administrators and security testers resolving large domain lists on networks they are authorized to assess	Best for: Security testers preparing authorized subdomain discovery
Free Free and open source under GPL-3.0.	Free Free and open source under the MIT license.
Windows, Linux, Command line	Command line
Handles bulk DNS lookups Reads resolver lists and domain names from files All 3 strengths for MassDNS Handles bulk DNS lookups Reads resolver lists and domain names from files Outputs DNS responses for later filtering	Generates domain variations using multiple permutation techniques Accepts custom wordlists All 3 strengths for DNSGen Generates domain variations using multiple permutation techniques Accepts custom wordlists Includes patterns for cloud providers and service names
Intended for authorized DNS reconnaissance and testing	Requires input domain names to generate permutations.
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
Official website Full listing and sources Sources for MassDNS github.com/blechschmidt/massdns Catalog checked October 8, 2026	Official website Full listing and sources Sources for DNSGen github.com/AlephNullSK/dnsgen Catalog checked October 8, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.