Drag devices from the left panel to start building your topology
↖
Click a node or link to configure it.
Drag from the palette to add devices.
Link Properties
Lower cost = preferred path. Default: 1
Device Config
Interfaces
Per-link IPs override the primary IP for routing and config generation.
Subnet Info
Network
Broadcast
Usable Range
Mask
Hosts
VLSM Engine
Requirements
Connectivity Test
Config Generator
Select a node and vendor to generate configuration.
Console
— no node —
Select a node then right-click → Open Console,
or click a node and switch to this tab.
Quick tip: Load a demo topology (🎮 Demo button)
to see a fully configured network you can explore.
10
$
Type help for available commands. Try ping, traceroute, show ip route.
Ready
Nodes:0
Links:0
Tool:Select
NetBuilder Pro — MYSYSAD.COM
S=Select C=Cable Del=Delete P=Ping F=Fit
🎮 Load Demo Topology
Load a pre-built network to explore NetBuilder Pro's features — packet simulation, VLSM, config export, and the node console. Your current canvas will be replaced.
🏠
Home Network
ISP modem → router → switch, NAS, desktop PCs, WiFi AP with laptop & IoT
8 nodes
🏢
Small Office
Firewall + core router with VLAN segmentation: servers, staff PCs, IoT zone
The link below contains your entire topology encoded in the URL fragment.
It never touches a server — everything is in the # portion
of the URL, which browsers do not send. Anyone with this link can open the exact same diagram.