IPv4 Subnet Calculator
Calculate IPv4 subnet details from an IP address and CIDR prefix or subnet mask, and split a network into equal-sized subnets.
Network details
Azure reserves the first four and last address: five per subnet. Azure IPv4 subnets use /2–/29. This is a size estimate: check address-space eligibility and service-specific minimum sizes before deployment.
More IPv4 properties
Split into equal subnets
IPv4 host ranges below are standard, not Azure ranges. Scroll horizontally to see all columns.
| # | Network | First IPv4 host | Last IPv4 host | Broadcast | IPv4 hosts | Azure usable |
|---|