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Nmap vs ZMap: catalog facts
Nmap	ZMap
Free Free for end users under the Nmap Public Source License. Redistributing Nmap inside a…	Free Free to download and use.
Windows, macOS, Linux, Command line	Linux, Command line
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	Scans very large address ranges quickly Tuning options for 10 gigabit networks
The licence is custom, not OSI-approved, and is incompatible with GPLv2 Companies redistributing Nmap in their own products need a commercial OEM licence	Intended for authorized testing and research only Command line only, with no graphical interface
Downloadable app	Downloadable app
Not stated if open source	Closed source
License: Nmap Public Source License	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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