CIDR / Subnet Calculator
Calculate IPv4 subnet details from CIDR notation. Instant results — no server required.
Split into
equal subnets
CIDR Cheat Sheet
| CIDR | Subnet Mask | Hosts | Common Use |
|---|---|---|---|
| /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 | Typical LAN |
| /25 | 255.255.255.128 | 126 | Half /24 |
| /28 | 255.255.255.240 | 14 | Small subnet |
| /32 | 255.255.255.255 | 1 | Single host |