Subnet Sketch
Enter a network and how many devices each group needs. Each group gets the smallest subnet that fits, largest first, drawn across the address range.
Plan
Subnets, largest first
| Group | Subnet | Mask | Gateway | Usable range | Needed / fits |
|---|
Each subnet keeps its network and broadcast addresses and uses the first usable address as the gateway; the rest is for devices. The smallest subnet handed out is a /30. The page address holds the plan, so it can be bookmarked or shared.