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THE FEUTEX TOOLKIT

IPv6 Prefix Allocation Count

Count equal allocation blocks between two IPv6 prefix lengths.

Networking workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaChild blocks = 2**(child-parent)

Made for real tasks

  • Count equal allocation blocks between two IPv6 prefix lengths.
Explore step-by-step workflows →

Worked example

Inputs

Parent prefix length
48 bits
Child prefix length
64 bits

Expected results

Child blocks
65536 blocks

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter parent prefix length, child prefix length in the displayed units.
  2. Calculate the scenario, then compare it with measurements before changing a system.

Try this example

{
  "parent": 48,
  "child": 64
}

Accuracy and scope

Counts allocations only, no address generation; limited to 52-bit counts for exact integer output.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.