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Subnet Calculator

Calculate IPv4 subnet masks, CIDR prefix notation (/24, /16), network address, broadcast address, and usable host ranges.

IP Address

Subnet Mask / CIDR (/24)

Subnet Mask255.255.255.0

Usable Hosts254

Total Addresses256

How to Use the Subnet Calculator

Enter your parameters: Type, paste, or select your input values above.
View instant results: Calculations update in real time as you change values.
Copy or export: Click copy, download, or print to use your results immediately.

About this Tool

Essential network engineering tool for subnetting: computes network ID, usable host IP range, broadcast IP, and total usable hosts.

Subnet Calculator Calculation Standards

Standard Algorithmic Processing & In-Browser Execution

Essential network engineering tool for subnetting: computes network ID, usable host IP range, broadcast IP, and total usable hosts.

Worked Example: Subnet Calculator Typical Use Case

Input:

Parameters entered into interactive input fields above

Output:

Instant real-time calculation and formatted results

All calculations execute client-side with 0 network latency and full privacy.

Frequently Asked Questions

Is Subnet Calculator completely free to use?

Yes. Subnet Calculator is 100% free with no subscriptions, usage limits, watermarks, or credit card requirements.

Does Subnet Calculator upload my files or private data to your servers?

No. Processing executes entirely inside your local browser memory using modern Web APIs. Your confidential inputs never leave your device.

Can I use Subnet Calculator on mobile phones and tablets?

Yes. All tools on TTech are fully responsive and optimized for touchscreens on iPhones, iPads, Android devices, and desktop computers.

Calculation Standards

Built in compliance with standard US calculation conventions and industry-accepted mathematical formulas. For tax, legal, or medical advice, consult certified professionals.