IPV4 NETWORK PLANNING
Turn an address into a complete subnet plan.
Enter an IPv4 address and CIDR prefix. See the network boundary, host range and capacity without sending the address anywhere.
CALCULATED BOUNDARY
192.168.10.0/24
24 network bits8 host bits
Network address
192.168.10.0Broadcast address
192.168.10.255Subnet mask
255.255.255.0Wildcard mask
0.0.0.255First usable
192.168.10.1Last usable
192.168.10.254READ THE PREFIX
What the CIDR number controls
Network boundary
The prefix identifies how many leading bits describe the network. A larger prefix creates a smaller subnet.
Host capacity
The remaining bits identify addresses inside the subnet. Traditional subnets reserve the network and broadcast addresses.
Routing summary
CIDR lets routers describe an entire address range with one concise route, such as 192.168.10.0/24.
Planning margin
Choose a subnet with enough usable addresses for current devices and realistic growth, without making the broadcast domain unnecessarily large.
Calculated on this device
The address and prefix stay in your browser. This application does not transmit or store subnet calculations.
Private network details can still be operationally sensitive. Share exported results only with authorized people.