Enter CIDR (0-32) or subnet mask (e.g., 24 or 255.255.255.0)
About This Subnet Calculator
Our subnet calculator helps network administrators calculate subnet masks, network addresses, broadcast addresses, and usable host ranges for IP addressing.
How to Use
- Enter an IP address (e.g., 192.168.1.100)
- Enter subnet mask in CIDR notation (e.g., 24) or dotted decimal (e.g., 255.255.255.0)
- Click "Calculate Subnet" to get detailed network information
- Use quick buttons for common subnet sizes (/8, /16, /24)
Common Subnet Sizes
| CIDR | Subnet Mask | Hosts | Class |
|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 | A |
| /16 | 255.255.0.0 | 65,534 | B |
| /24 | 255.255.255.0 | 254 | C |
| /25 | 255.255.255.128 | 126 | C |
| /26 | 255.255.255.192 | 62 | C |
| /27 | 255.255.255.224 | 30 | C |
| /28 | 255.255.255.240 | 14 | C |
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