Dotted-decimal (e.g. 10.0.0.1)
Enter 0–32 (with or without /)
Common CIDR Reference
| CIDR | Subnet Mask | Total | Usable | Use Case |
|---|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,216 | 16,777,214 | Class A Enterprise |
| /16 | 255.255.0.0 | 65,536 | 65,534 | ISPs |
| /24 | 255.255.255.0 | 256 | 254 | Office LAN |
| /28 | 255.255.255.240 | 16 | 14 | Small Segments |
| /30 | 255.255.255.252 | 4 | 2 | Point-to-Point |
| /32 | 255.255.255.255 | 1 | 1 | Host Route |