Subnet Calculator
About Subnet Calculations
This calculator helps network administrators with IPv4 subnet calculations, including:
- Determining network and broadcast addresses
- Calculating usable host IP range
- Identifying total number of hosts
- Converting between subnet mask formats
Common Subnet Masks:
| CIDR Notation | Subnet Mask | Hosts per Subnet |
|---|---|---|
| /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 |
Key Networking Terms:
- Network Address: The first address in a subnet (identifies the network)
- Broadcast Address: The last address in a subnet (used for broadcast messages)
- Usable Hosts: IP addresses that can be assigned to devices
- CIDR Notation: Compact representation of subnet masks (e.g., /24)