IP Range to CIDR Converter

Convert start and end IPv4 address ranges into the minimal set of covering CIDR blocks.

How It Works & Processing Standards

Convert start and end IPv4 address ranges into the minimal set of covering CIDR blocks.

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

Current Limits

  • Maximum input length: 100,000 characters

IP Range to CIDR Converter 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 IP Range to CIDR Converter

  1. 1
    Provide Start & End IPsEnter starting and ending IP addresses.
  2. 2
    Generate CIDR BlocksCopy the list of covering CIDR notations.

Common Use Cases

  • Creating AWS Security Group rules and firewall policies from legacy IP range specifications
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