Back to calculator
TechnologyGenerated accuracy model review: 2026-05-06
VLAN IP Planning Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Smallest subnet chosen where 2^(32 - prefix) - 2 is at least required hosts per VLAN.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- VLAN Count: 12
- Hosts per VLAN: 75
- Growth Buffer: 25%
- Reserved IPs: 10
Expected outputs
- Recommended Prefix: /25
- Required Hosts per VLAN: 104
- Usable Hosts per VLAN: 126
- Total Addresses Across VLANs: 1,536
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- Inputs are user-entered because pricing, deadlines, policies, and technical limits vary.
- Calculations run locally in your browser and do not store passwords, incidents, network designs, or security program data.
- This is planning math, not security assurance, legal advice, or a substitute for testing.
Unit handling
- VLAN Count accepts numeric values.
- Hosts per VLAN accepts numeric values.
- Growth Buffer accepts values in %.
- Reserved IPs accepts numeric values.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current vlan-ip-planning-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for VLAN IP Planning Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.