IPv6 Subnet Calculator

Enter an IPv6 address and /0–/128 prefix to calculate the subnet network, final address, normalized forms, and total address count.

IPv6 address

Prefix length

—Prefix

—Total addresses

—Host bits

—Address type

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How to use this IPv6 Subnet Calculator

Calculate IPv6 network boundaries and address counts from an address and prefix. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.