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Netsleuth vs cidr: catalog facts
Netsleuth	cidr
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the MIT license.
Linux, Command line	Windows, macOS, Linux, Command line
Focused tool for subnet calculations Graphical app and command-line interface in one package	Handles both IPv4 and IPv6 ranges Checks containment and overlapping ranges
Linux only Command-line use requires adding a shell alias for the Flatpak	A command-line tool without a graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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