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THE FEUTEX TOOLKIT

IPv4 CIDR Subnet Split Count

Count equal child networks and addresses when splitting a parent prefix.

Networking workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaChild subnets = 2**(child-parent); Addresses per child = 2**(32-child)

Made for real tasks

  • Count equal child networks and addresses when splitting a parent prefix.
Explore step-by-step workflows →

Worked example

Inputs

Parent prefix length
16 bits
Child prefix length
24 bits

Expected results

Child subnets
256 subnets
Addresses per child
256 addresses

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": 16,
  "child": 24
}

Accuracy and scope

Address counts include all addresses; does not reserve network or broadcast addresses.

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.