Calculateur de Subnet Host Count
Calculate the number of usable host addresses for a given subnet mask CIDR prefix.
Formula and method
This calculator computes Total addresses, Usable hosts directly in your browser without sending data to an external server.
Mathematical formula
- Total addresses:
2^(32-cidr) - Usable hosts:
cidr===32 ? 1 : cidr===31 ? 2 : 2^(32-cidr)-2
Variables and parameters
- CIDR prefix length (cidr): default value 24.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does Subnet Host Count Calculator use?
Subnet Host Count Calculator evaluates outputs such as <strong>Total addresses, Usable hosts</strong> based on inputs including CIDR prefix length. Check the Mathematical Method section for the explicit formula.
What happens if I enter invalid or zero values into Subnet Host Count Calculator?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in Subnet Host Count Calculator saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is Subnet Host Count Calculator free to use?
Yes. Subnet Host Count Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Subnet Host Count Calculator store or upload my data?
No. Subnet Host Count Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Subnet Host Count Calculator?
Subnet Host Count Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Subnet Host Count Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Subnet Host Count Calculator to your own blog post or page.