Subnet Calculator

Calculate IP subnets, CIDR notation, network ranges, and subnet masks

How to Use the Subnet Calculator

1. Enter IP Address: Input any valid IPv4 address (e.g., 192.168.1.1)

2. Enter CIDR: Specify the subnet size using CIDR notation (0-32)

3. View Results: Get detailed subnet information including network address, broadcast address, and host range

4. Split Subnets: Use the subnet splitting feature to divide your network into smaller subnets

5. Recursive Splitting: Further split individual subnets by clicking the split button on each subnet

6. Auto-Update: Split subnets automatically update when you change the IP address or CIDR notation

7. Export Data: Download complete subnet data (main subnet + all splits) as a single CSV file

Common CIDR Values

/24: 256 hosts (254 usable)

/25: 128 hosts (126 usable)

/26: 64 hosts (62 usable)

/27: 32 hosts (30 usable)

/28: 16 hosts (14 usable)

/29: 8 hosts (6 usable)

/30: 4 hosts (2 usable)

/31: 2 hosts (0 usable)

/32: 1 host (0 usable)