Subnet Calculator
Subnet Calculator helps you calculate network subnet properties quickly with transparent formulas.
Formula
Hosts = 2^(32-cidr)-2
Step-by-step
- Compute host bits as 32-cidr.
- Apply 2^hostBits - 2.
Example
Using default values, result: Usable hosts 254
Frequently asked questions
How accurate is the Subnet Calculator?
Results are estimate-grade and depend on your inputs and assumptions.
Can I use Subnet Calculator for professional decisions?
Use this as guidance and verify with a qualified professional when stakes are high.
For educational purposes only. Results are estimates, not professional advice.
Last reviewed: 2026-07-14