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ipcalccidr
Free

Free and open source under the GPL.

 Free

Free and open source under the MIT license.

Linux, Command line Windows, macOS, Linux, Command line
  • Handles IPv4 and IPv6 with machine-readable output for scripting
  • Removes an entire class of subnetting arithmetic mistakes
  • Handles both IPv4 and IPv6 ranges
  • Checks containment and overlapping ranges
  • Several unrelated programs share the name ipcalc, which causes confusion
  • Command line only
  • A command-line tool without a graphical interface
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0 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

Checked September 22, 2026

Checked October 8, 2026

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