Calculate subnets, aggregate networks, and plan your IP addressing
Enter an IPv4 address with CIDR prefix (e.g., 192.168.1.0/24)
Displaying first 256 subnets only.
| # | Network Address | Usable Host Range | Broadcast Address |
|---|
Cloud providers typically reserve additional IP addresses within each subnet for infrastructure purposes. For example, the first few addresses may be reserved for the network gateway, DNS, and future use. Always consult your cloud provider's documentation for exact reservation policies when planning subnet sizes.
Enter the number of usable host addresses you need
Must be a power of 2 (2, 4, 8, 16, ...)
Must be greater than the base CIDR prefix
Displaying first 1024 subnets only. Use the Download CSV button to get all subnets.
| # | Network | Broadcast | First Usable | Last Usable | Addresses |
|---|
Enter one CIDR notation per line
| # | Network | First IP | Last IP (Broadcast) |
|---|