IP Subnet Calculator
Calculate IPv4 subnet information including network address, broadcast address, usable host range, and CIDR notation.
IP Subnet Calculator
CIDR notation
Subnet mask: ...
Range: 0-32 (0 = 0.0.0.0, 32 = 255.255.255.255)
Quick Examples
Common Network Examples
192.168.1.0/24
Standard home network
10.0.0.0/8
Large corporate network
172.16.0.0/16
Medium-sized network
192.168.1.0/26
Small office network
Features
CIDR Support
Full CIDR notation support from /0 to /32
Network Information
Network address, broadcast address, first and last host
Host Count
Total and usable host count calculations
Binary Display
IP addresses shown in both decimal and binary
Copy to Clipboard
One-click copying of all IP addresses and information
Real-time Calculation
Instant subnet calculations as you type
Usage Tips
•Enter the network address (usually ending in .0) for accurate calculations
•CIDR notation ranges from /0 (0.0.0.0) to /32 (255.255.255.255)
•Common CIDR values: /24 (256 hosts), /16 (65,536 hosts), /8 (16,777,216 hosts)
•Usable hosts exclude network and broadcast addresses
•Click any IP address to copy it to your clipboard
•Use the quick examples to get started with common network configurations
CIDR Reference
| CIDR | Subnet Mask | Hosts | Use Case |
|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,216 | Class A networks |
| /16 | 255.255.0.0 | 65,536 | Class B networks |
| /24 | 255.255.255.0 | 256 | Class C networks |
| /26 | 255.255.255.192 | 64 | Small offices |
| /28 | 255.255.255.240 | 16 | Small networks |
| /30 | 255.255.255.252 | 4 | Point-to-point |