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IPCalc vs cidr: catalog facts
IPCalc	cidr
Free Free and open source under GPL-3.0-only.	Free Free and open source under the MIT license.
Android	Windows, macOS, Linux, Command line
Calculates network and broadcast addresses Converts IP addresses to binary	Handles both IPv4 and IPv6 ranges Checks containment and overlapping ranges
Geolocation identifies the country and possibly the city associated with an IP address.	A command-line tool without a graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	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.