Instantly calculate network netmasks, broadcast addresses, usable IP address ranges, and total host capacities from any IP and CIDR prefix.
Configuring Virtual Private Clouds (VPCs) in AWS, GCP, or Azure requires dividing large IP ranges into non-overlapping subnets for web tiers, database clusters, and internal services.
This in-browser calculator takes any IP address and CIDR prefix, parsing subnet masks, broadcast boundaries, and exact usable address ranges.
Usable hosts equal 2^(32 - prefix) - 2. Two addresses are reserved: the network address (first IP) and the broadcast address (last IP).
A /24 subnet (netmask 255.255.255.0) providing 254 usable host addresses is the standard building block for cloud subnets and office LANs.
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