IP Subnet Calculator
Calculate IP subnets, CIDR notation, and network information securely in your browser.
Network Input
/0/8/16/24/32
255.255.255.0
Network Information
Enter a valid IP address to see network information
Common Subnet Reference
| CIDR | Subnet Mask | Usable Hosts | Notes |
|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 | Class A |
| /16 | 255.255.0.0 | 65,534 | Class B |
| /24 | 255.255.255.0 | 254 | Class C |
| /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 | Point-to-point |
| /31 | 255.255.255.254 | 2 | RFC 3021 |
| /32 | 255.255.255.255 | 1 | Single host |