IPv4 Subnet Mask & Host Calculator

Detailed subnet breakdown showing network address, wildcard mask, host capacity, and assignable IP range.

How It Works & Processing Standards

Detailed subnet breakdown showing network address, wildcard mask, host capacity, and assignable IP range.

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 Subnet Mask & Host 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 Subnet Mask & Host Calculator

  1. 1
    Specify CIDR BlockInput your network CIDR (e.g. 172.16.0.0/20).
  2. 2
    Analyze Subnet DataCheck usable hosts and broadcast boundaries in a clean table.

Common Use Cases

  • Designing corporate VLAN partitions and allocating address space for Kubernetes clusters
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