Subnetly is a fast, clean workspace for designing and documenting IP networks. Plan subnets, assign VLANs, capture gateways and devices — and export a reference your whole team can use.
| Network | CIDR | VLAN | Type |
|---|---|---|---|
| Server LAN | 10.0.1.0/24 | 100 | Routed |
| Management | 10.0.10.0/24 | 200 | Mgmt |
| WAN Transit | 10.0.50.0/30 | — | Transit |
| Guest WiFi | 10.0.100.0/23 | 300 | Guest |
Built by a network engineer for network engineers. No ads. No tracking. No nonsense.
See your entire address block as a proportional diagram. Instantly know what's allocated, what type it is, and where space remains.
Need the next available /24? Next VLAN ID? Subnetly calculates it from your existing allocations — no manual hunting.
Gateway IP, controlling device, network type, VLAN ID, status. All the fields spreadsheets make painful — done properly.
Generate PDF reports and Excel exports ready to hand to a colleague, attach to a change request, or file for audit.
Single subnet details, VLSM planning, prefix length slider — all free, no account required. Just open and calculate.
Organise your network plans by site. Auckland HQ, Wellington DR, cloud VPCs — each with their own address space and devices.
Buy once. No subscription. No account required for the free calculator.
The calculator is always free. No account, no email, no friction.