Subnet Calculator
Calculate network details from any IPv4 address and subnet mask or CIDR notation. Get network address, broadcast address, host range, usable hosts, and binary representations.
Common CIDR Reference
| CIDR | Subnet Mask | Usable Hosts |
|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 |
| /16 | 255.255.0.0 | 65,534 |
| /20 | 255.255.240.0 | 4,094 |
| /22 | 255.255.252.0 | 1,022 |
| /24 | 255.255.255.0 | 254 |
| /25 | 255.255.255.128 | 126 |
| /26 | 255.255.255.192 | 62 |
| /27 | 255.255.255.224 | 30 |
| /28 | 255.255.255.240 | 14 |
| /29 | 255.255.255.248 | 6 |
| /30 | 255.255.255.252 | 2 |
| /32 | 255.255.255.255 | 1 |
How to Use the Subnet Calculator
- Enter an IPv4 address (e.g., 192.168.1.100 or 192.168.1.0/24).
- Enter a CIDR prefix length or subnet mask (e.g., 24 or 255.255.255.0).
- Click Calculate to see all subnet details.
- Use the quick CIDR buttons for common prefix lengths.
What is Subnetting?
Subnetting divides a larger network into smaller, more manageable sub-networks. It improves security, reduces broadcast traffic, and allows efficient use of IP addresses. CIDR notation (e.g., /24) indicates how many bits are used for the network portion of the address.
Features
- CIDR and subnet mask input support
- Network address, broadcast, and host range
- Binary representation of all addresses
- IP class and type detection
- Common CIDR reference table
- 100% client-side processing for full privacy
Disclaimer:This tool is provided “as is” for informational and educational purposes only. Results may not be 100% accurate. ToolBird makes no warranties, express or implied, regarding the accuracy, reliability, or completeness of any output generated by this tool. This tool does not constitute professional, legal, financial, medical, or tax advice. Always consult a qualified professional for important decisions. By using this tool, you agree that ToolBird and its operators shall not be held liable for any damages, losses, or consequences arising from the use of this tool or reliance on its results. All processing occurs in your browser — we do not store, transmit, or access your data. Use at your own risk.