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IPv4 List Diff
Compare two lists of IPv4 addresses and CIDR blocks as sets: what only list A covers, what only list B covers, and the overlap.
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
Both lists are treated as sets of addresses (one entry per line or comma-separated; bare addresses are /32). The tool computes A − B, B − A, and A ∩ B by exact range arithmetic and returns each as a minimal CIDR list. "Identical" means the two lists cover exactly the same addresses even if written differently. Invalid lines are reported per list and skipped. Up to 5,000 entries per list.