IPv4 Host Capacity Calculator

Calculate total address space, usable host IP count, and RFC network/broadcast reservation rules for any prefix.

How It Works & Processing Standards

Calculate total address space, usable host IP count, and RFC network/broadcast reservation rules for any prefix.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 100,000 characters

IPv4 Host Capacity Calculator is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use IPv4 Host Capacity Calculator

  1. 1
    Enter CIDRProvide target CIDR block.
  2. 2
    Review CapacitiesView total addresses, usable hosts, and reservation notes.

Common Use Cases

  • Sizing Kubernetes node pools and planning office DHCP lease pools
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