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Subnet Usable Hosts — result sheet
Usable hosts, network size, and mask for a CIDR prefix /1-/30.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: size = 2^(32-prefix); usable = size - 2; mask from prefix bits.
Host bits hold the address block; network and broadcast stay reserved, leaving size minus two. Prefixes /31 and /32 break that rule and are refused.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- CIDR prefix — /31 and /32 are special cases and are rejected.; minimum 1; maximum 30
Worked example
| Input | Value |
|---|---|
| CIDR prefix | 24 |
254 usable hosts; 256 addresses; mask 255.255.255.0.
Assumptions and limits
- Classic IPv4 unicast; network and broadcast reserved.
- Prefix is a whole number from 1 to 30.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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