IPv6 CIDR Calculator

Calculate the prefix, host bits, and size of an IPv6 network.

How to use this tool

This tool helps review network configurations and decisions more consistently. Check the values before applying them to production equipment or services.

Verify addresses, prefixes, and limits before saving a configuration.
Document the results so others can repeat the diagnostic or installation.

Practical tip: Test network changes in a controlled environment before applying them to active infrastructure.

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