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ipcalc vs Netsleuth: catalog facts
ipcalc	Netsleuth
Free Free and open source under the GPL.	Free Free and open source under the GPL-3.0-or-later licence.
Linux, Command line	Linux, Command line
Handles IPv4 and IPv6 with machine-readable output for scripting Removes an entire class of subnetting arithmetic mistakes	Focused tool for subnet calculations Graphical app and command-line interface in one package
Several unrelated programs share the name ipcalc, which causes confusion Command line only	Linux only Command-line use requires adding a shell alias for the Flatpak
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	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 September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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