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SubNetCalc vs cidr: catalog facts
SubNetCalc	cidr
Free Free under the GPL license.	Free Free and open source under the MIT license.
Command line	Windows, macOS, Linux, Command line
Calculates IPv4 and IPv6 network details Displays addresses in binary	Handles both IPv4 and IPv6 ranges Checks containment and overlapping ranges
Command-line interface	A command-line tool without a graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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