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About Subnet Mask Calculator
Free online subnet calculator, supports IP address subnet division, CIDR calculation, network address, broadcast address, usable IP range, host count and other quick calculations. Suitable for network planning, IP allocation, subnet mask calculation and other scenarios.
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User Guide
Key Features
- Free online subnet calculator — instantly compute subnet division, CIDR, network and broadcast addresses, usable IP range, and host count
- Ideal for network planning, IP allocation, and subnet mask calculation
How to Use
- Open the tool page — no download or installation needed
- Enter an IP address and choose a subnet mask or set the CIDR prefix
- Click "Calculate" to view the results, verify them, and copy any value with one click
Important Notes
- The tool is completely free and requires no sign-up or login
- All calculations run locally in your browser — your data is never uploaded
Frequently Asked Questions
What is Subnet Mask Calculator?
Free online subnet calculator, supports IP address subnet division, CIDR calculation, network address, broadcast address, usable IP range, host count and other quick calculations. Suitable for network planning, IP allocation, subnet mask calculation and other scenarios.
How do I use Subnet Mask Calculator?
Open the tool page — no download or installation needed Enter an IP address and choose a subnet mask or set the CIDR prefix Click "Calculate" to view the results, verify them, and copy any value with one click
What should I know before using Subnet Mask Calculator?
The tool is completely free and requires no sign-up or login All calculations run locally in your browser — your data is never uploaded
Is Subnet Mask Calculator free to use?
Yes, Subnet Mask Calculator is completely free. No download or installation required — it runs right in your browser.