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masscan vs ZMap: catalog facts
masscan	ZMap
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free to download and use.
macOS, Linux, Command line	Linux, Command line
Uses a high-throughput command-line scanning engine.	Scans very large address ranges quickly Tuning options for 10 gigabit networks
High packet rates can overwhelm networks if poorly configured.	Intended for authorized testing and research only Command line only, with no graphical interface
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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