CIDR Block Aggregator & Merger

Merge overlapping and adjacent IPv4 CIDR blocks into the smallest possible set of aggregated subnets.

How It Works & Processing Standards

Merge overlapping and adjacent IPv4 CIDR blocks into the smallest possible set of aggregated subnets.

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 Block Aggregator & Merger 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 Block Aggregator & Merger

  1. 1
    Paste CIDR ListEnter multiple CIDR blocks separated by commas or line breaks.
  2. 2
    Merge SubnetsReceive the minimal aggregated CIDR list.

Common Use Cases

  • Optimizing BGP routing tables and cleaning up cloud security group rules
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