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masscan vs Nmap: catalog facts
masscan	Nmap
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free for end users under the Nmap Public Source License. Redistributing Nmap inside a…
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Uses a high-throughput command-line scanning engine.	Host discovery, port scanning, service and version detection and OS fingerprinting in one tool The Nmap Scripting Engine adds hundreds of Lua scripts for specific checks
High packet rates can overwhelm networks if poorly configured.	The licence is custom, not OSI-approved, and is incompatible with GPLv2 Companies redistributing Nmap in their own products need a commercial OEM licence
Downloadable app	Downloadable app
Open source	Not stated if open source
License: AGPL-3.0	License: Nmap Public Source License
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 20, 2026

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