NetworkLOCALRuns in your browser
IPv4 List Deduplicator
Normalize, sort, and de-duplicate a list of IPv4 addresses and CIDR blocks — optionally dropping contained blocks or aggregating.
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
Each line (or comma-separated entry) is parsed as a CIDR block; bare addresses become /32 and host bits are cleared. Exact duplicates are always removed. "Drop contained blocks" also removes any block fully inside another. "Aggregate" merges everything into the smallest equivalent CIDR set. Invalid lines are listed and skipped. Up to 5,000 entries.