CIDR IPv4 Subnet Calculator

Calculate network address, broadcast address, subnet mask, usable host range, and total IP count from any IPv4 CIDR block.

How It Works & Processing Standards

Calculate network address, broadcast address, subnet mask, usable host range, and total IP count from any IPv4 CIDR block.

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

Current Limits

  • Maximum input length: 100,000 characters

CIDR IPv4 Subnet 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 CIDR IPv4 Subnet Calculator

  1. 1
    Enter CIDR NotationType an IPv4 address with prefix length (e.g. 192.168.1.0/24 or 10.0.0.0/16).
  2. 2
    Inspect Subnet MetricsInstantly view network, broadcast, subnet mask, and usable host address ranges.

Common Use Cases

  • Configuring cloud VPC subnets in AWS, GCP, or Azure, and auditing corporate LAN router tables
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