IP / Subnet Calculator
IP / Subnet CalculatorCIDR, usable IPs, broadcast. Fast, free and secure — works in your browser. By AK Computer, Dwarka.
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How to use
- 1 Enter an IP address and its CIDR prefix or subnet mask.
- 2 Click Calculate to compute the network details.
- 3 Read the network address, broadcast, and usable range.
- 4 Note the total and usable host counts for planning.
Frequently Asked Questions
How do I calculate usable IPs for a subnet?
Enter the IP and CIDR prefix, and the tool shows the network address, broadcast, and the usable host range between them.
What does a /24 subnet mean?
A /24 uses a 255.255.255.0 mask, giving 256 addresses with 254 usable hosts after reserving the network and broadcast addresses.
Why are two IPs unusable in every subnet?
The first address is the network identifier and the last is the broadcast address, so they cannot be assigned to devices like cameras or an NVR.