Network Tools
CIDR Calculator
Ready
Controls
Input Rules
IPv4 only. Enter CIDR notation or separate IP and prefix. IPv6 is intentionally rejected in this browser-only tool.
Example
10.10.5.20/27
Subnet splitting
By number of subnets or required hosts.
No network0 hosts0 subnets
Calculate a CIDR block to see results.
| # | CIDR | Network | Usable Range | Broadcast | Hosts |
|---|---|---|---|---|---|
| No split subnets yet. | |||||
Calculate a CIDR block to see JSON.
All calculations run locally in your browser.