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cidr vs Netsleuth: catalog facts
cidr	Netsleuth
Free Free and open source under the MIT license.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux, Command line	Linux, Command line
Handles both IPv4 and IPv6 ranges Checks containment and overlapping ranges	Focused tool for subnet calculations Graphical app and command-line interface in one package
A command-line tool without a graphical interface	Linux only Command-line use requires adding a shell alias for the Flatpak
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
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 October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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