← All projects
Security & networking · JavaScript
Subnet Calculator
IPv4 details, equal splits and VLSM plans — everything runs in your browser, nothing is uploaded.
Network details live
Enter an address with a prefix or mask to see the full breakdown.
Split into equal subnets
| Subnet | Hosts | Range | Broadcast |
|---|
VLSM planner
One requirement per line: name, hosts. Subnets are allocated largest first inside the network above.
| Name | Needs | Subnet | Usable | Range |
|---|
Route summarization
One network per line. Returns the fewest equivalent CIDRs and the smallest single supernet that covers them all.