VLSM planner | Toolkit

Parent network

The address space to allocate.

Base network / prefix

Use a network boundary, e.g. 192.168.0.0/20.

LAN mode: each subnet reserves its network and broadcast addresses. Small LANs use at least /30.

Allocated largest first, regardless of row order.

5 networks

Network nameHosts needed

Include gateways in host counts.

Parent address space4,096192.168.0.0/20

Allocated addresses94423.0% of parent network

Free addresses3,1524 available CIDR blocks

Segments are proportional to their address count. Select a subnet to inspect it.

192.168.0.0/20

192.168.0.0192.168.15.255

Free space

01,0242,0483,0724,096 addresses

Free

Selected subnetLAN A192.168.0.0/23

Usable range192.168.0.1 192.168.1.254

Host capacity500 / 510 used

Each row is a complete subnet. Scroll horizontally for all address details.

Required	Allocated subnet	Usable range	Capacity	Unused	Mask	Wildcard	Network address	Broadcast
500	`192.168.0.0/23`	`192.168.0.1 192.168.1.254`	510	10	255.255.254.0	0.0.1.255	192.168.0.0	192.168.1.255
200	`192.168.2.0/24`	`192.168.2.1 192.168.2.254`	254	54	255.255.255.0	0.0.0.255	192.168.2.0	192.168.2.255
70	`192.168.3.0/25`	`192.168.3.1 192.168.3.126`	126	56	255.255.255.128	0.0.0.127	192.168.3.0	192.168.3.127
30	`192.168.3.128/27`	`192.168.3.129 192.168.3.158`	30	0	255.255.255.224	0.0.0.31	192.168.3.128	192.168.3.159
10	`192.168.3.160/28`	`192.168.3.161 192.168.3.174`	14	4	255.255.255.240	0.0.0.15	192.168.3.160	192.168.3.175

5 non-overlapping allocationsLargest blocks first · aligned boundaries

The remaining space expressed as aligned CIDR blocks.

192.168.3.176/28

192.168.3.192/26

192.168.4.0/22

192.168.8.0/21

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