IP Subnet Planner
VLSM subnet calculator for VCF 9, NSX, and vSAN deployments. Three guided steps: define your supernet, configure subnet requirements, then get your full IP plan.
VLSM
VCF 9 Presets
Supernet Planning
vSAN · NSX · vMotion
IP Allocation
Block Map
Your data stays on your device. All calculations run entirely in your browser — no data is sent to any VirtualBytes server.
Base network (CIDR notation)
Invalid CIDR — use format x.x.x.x/prefix (e.g. 172.16.0.0/16)
Quick presets
VCF 9 Standard
Management, vSAN, vMotion, NSX TEP, Edge uplinks, OOB
8 networks VCF Multi-cluster
Expanded for 3 workload domains with separate TEP pools
14 networks NSX Segments only
Host TEP, Edge TEP, and overlay segment subnets
3 networks Custom
Start from a blank subnet list and define your own
0 networks Subnet requirements By prefix (/)
By host count
Name
Suggested network
/ Prefix
Supernet is too small to fit all subnets. Increase the supernet or reduce subnet sizes.
Address space utilisation
Name Network / CIDR Subnet mask Gateway First host Last host Broadcast Usable