Formula Explanation
Addresses = 2^(32 - CIDR)
This calculator applies the formula Addresses = 2^(32 - CIDR). Enter each value with the matching unit, and AZCalculate updates the result instantly.
IT & Digital
IP Subnet Calculator
Use this ip subnet calculator to calculate calculate subnet addresses and usable hosts from a cidr prefix.
ip subnetcidrhostsnetworking
Calculator
Calculate instantly
Calculator Inputs
Choose what you want to calculate, enter realistic values, adjust units where shown, and use the scenario section for repeated-use planning.
Input and Formula Breakdown
This calculator applies the formula Addresses = 2^(32 - CIDR). Enter each value with the matching unit, and AZCalculate updates the result instantly.
CIDR prefix
24
Reserved addresses
2
Total addresses
256
Usable hosts
254
Scenario and Comparison
Current
256
Projected
3,072
Adjusted
281.6
Visual Comparison
Current result256
Projected usage3,072
Comparison scenario281.6
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Use Cases
- Plan network ranges
- Estimate usable hosts
- Study CIDR
Step-by-Step Explanation
- Step 1Enter the known values in the calculator fields.
- Step 2Keep the units consistent with the labels shown beside each input.
- Step 3Apply the formula: Addresses = 2^(32 - CIDR).
- Step 4Review the primary result and supporting values.
Example calculation
Example ip subnet calculator
Given
- CIDR prefix: 24
- Reserved addresses: 2
Steps
- Use the values shown above.
- Apply Addresses = 2^(32 - CIDR).
Result
The calculator above shows the computed answer instantly from these example values.
Calculator guide
About this IP Subnet Calculator
Calculate subnet addresses and usable hosts from a CIDR prefix. This page includes an interactive calculator, concise formula notes, worked examples, FAQs, related calculators, and practical guidance you can revisit whenever needed.
Found something that does not look right?
We work hard to keep every calculator accurate and useful. If you notice a calculation error, missing option, or unclear explanation, please let us know so we can review and correct it promptly.
Calculator usage
See how many people are using this calculator.
Total visits today
0
Live users now
0
Total saved calculations
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Most active date
2026-06-05
FAQ
IP Subnet Calculator FAQs
How does the ip subnet calculator work?+
It uses Addresses = 2^(32 - CIDR) and calculates the result from the values you enter.
Can I copy or print the result?+
Yes. AZCalculate calculator pages include copy, share, and print actions.
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