Azure Visual Subnet Calculator
Interactive subnet planning tool. Divide and join subnets to design your Azure VNet architecture.
Visual Subnet Calculator
Enter your VNet address space and interactively split it into subnets
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Quick Start:
Azure Reserved IP Addresses
Azure reserves 5 IP addresses in each subnet that cannot be assigned to resources:
x.x.x.0 Network address identifier
x.x.x.1 Default gateway for the subnet
x.x.x.2, x.x.x.3 Azure DNS IP addresses
x.x.x.255 Broadcast address for the subnet
The "Useable IPs" column shows available addresses after excluding these 5 reserved IPs.