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ipv6calc vs cidr: catalog facts
ipv6calc	cidr
Free Free and open source under the GNU GPL version 2.	Free Free and open source under the MIT license.
Linux, Command line	Windows, macOS, Linux, Command line
Converts and calculates IPv4 and IPv6 address information Includes tools for log conversion, anonymization and statistics	Handles both IPv4 and IPv6 ranges Checks containment and overlapping ranges
Some database features require separately stored databases or optional libraries The project notes that the C program may have security weaknesses	A command-line tool without a graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-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.