IP Subnet Calculator
Calculate IPv4 network, broadcast, usable range, subnet mask, and host count from CIDR notation.
This page is an editable estimator with realistic defaults so you can model your own situation in minutes.
IPv4 subnet fields are calculated from the address and CIDR prefix bit mask.
Treat the result as a planning estimate and verify important numbers with the relevant official source before acting.
| First usable | 192.168.1.1 | |
|---|---|---|
| Last usable | 192.168.1.254 | |
| Wildcard mask | 0.0.0.255 | |
| Total addresses | 256 |
Assumptions
- Use these tools for planning and low-risk data unless your policy permits otherwise.
- Real systems can differ because of platform rules, routing, protocol overhead, encoding expectations, scanner behavior, and security policies.
- Verify production infrastructure, credentials, codes, and encoded payloads before deployment.
How this tool works
Formula used
IPv4 subnet fields are calculated from the address and CIDR prefix bit mask.
Example use
Plug in your own numbers and the result updates instantly. IPv4 subnet fields are calculated from the address and CIDR prefix bit mask.
IP Subnet Calculator FAQ
Is this ip subnet calculator safe for sensitive data?
Use it for general planning and low-risk data. Do not paste production secrets, private keys, access tokens, customer data, regulated data, or confidential credentials into browser tools unless you have verified the environment and policy.
Are the outputs guaranteed for production systems?
No. Verify network, security, encoding, bandwidth, QR, and implementation details in your actual infrastructure, browser, device, scanner, and deployment environment.
Why might my result differ from a real system?
Real systems can differ because of routing rules, reserved addresses, protocol overhead, throttling, compression, encoding expectations, scanner quality, password policy, and platform-specific behavior.