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CIDR Aggregator & Range Converter

Convert IPv4 ranges to CIDRs and merge adjacent or duplicate networks without adding addresses. Work locally without uploading network information.

Runs entirely on your deviceNo uploads, accounts, cookies, or personal tracking.

Aggregate exact ranges

Local processing · no input storage

Network tools
One entry per line; an optional name may precede the address.

Returns the exact union. This does not create a broader covering route that would include gaps.

Text lists: up to 500 non-empty lines and 256 KiB per field. Tabular results: up to 5,000 rows.

Enter your data, then select aggregate exact ranges.

Technical reference: RFC 4632

1. Add your data

Enter your network data or load the worked example.

2. Choose the result

Aggregate exact ranges and review the result and assumptions.

3. Save it locally

Copy the result or download it for your engineering workflow.

About this tool

Use CIDR Aggregator & Range Converter without an upload

Convert IPv4 ranges to CIDRs and merge adjacent or duplicate networks without adding addresses. Work locally without uploading network information.

The operation runs in the current browser tab. Tool input is not included in aggregate analytics, and the standalone download makes no analytics requests.

Network toolsDeveloper tools