OmniCastCONVERTER
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CIDR Set Calculator

Enter IPv4 CIDRs separated by whitespace, commas, or lines.

Paste, type, or drag & drop a text file 28 chars · 2 lines · 28 B

Used by union, intersection, and subtraction. It may be empty only for summarize mode.

Paste, type, or drag & drop a text file 13 chars · 1 lines · 13 B
Options
Choose how the two address sets should combine.
Runs locally in this browserPreview updates after 240 ms · Nothing is uploaded. Passwords are stored only when you explicitly choose Remember on this device.
02
Tool outputMerged address ranges and the minimal exact IPv4 CIDR list.
Run toolNothing is uploaded. Passwords are stored only when you explicitly choose Remember on this device.
About this utility

How to use CIDR Set Calculator

Summarize, union, intersect, or subtract large IPv4 CIDR lists and return the exact minimal set.

What to provide

Enter IPv4 CIDRs separated by whitespace, commas, or lines.

Used by union, intersection, and subtraction. It may be empty only for summarize mode.

  1. Paste, type, or drag and drop a supported text file into the input area.
  2. Place the second value or file in the adjacent panel. Sensitive fields are masked by default.
  3. Choose the options that match your intended result.
  4. Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.

Use “Swap inputs” to reverse the comparison without copying either value.

What the result means

Merged address ranges and the minimal exact IPv4 CIDR list.

Privacy and safety

This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.

Limitations

  • Everything is processed in this browser tab. Input, filenames, keys, and output are never uploaded or saved. IPv6 sets, routing policy, ownership, ACL ordering, and reachability are outside this exact IPv4 set calculator.

Try the included example

Select “Load example” at any time to restore this tested sample.

192.0.2.0/24
198.51.100.0/25
192.0.2.64/26
Keep working

Related web developer tools

IPv4 CIDR & Subnet CalculatorOpen tool →IPv4 Range Expander & SummarizerOpen tool →IPv6 CIDR CalculatorOpen tool →
Converter handoffs

Converters that feed this tool

Run a conversion, then choose “Send to utility.” The result is prefilled in memory without entering the URL or browser storage.

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