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IPv4 CIDR Aggregator
Collapse a list of IPv4 addresses and CIDR blocks into the smallest equivalent set of CIDR blocks.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
How it works
Every entry (one per line or comma-separated; bare addresses count as /32) is merged into the minimal ordered CIDR list that covers exactly the same addresses — adjacent blocks are combined, contained blocks absorbed. This is exact set aggregation, not lossy route summarization: the result never covers an address the input did not. Invalid lines are listed separately and skipped. Up to 5,000 entries.