Kernaali ToolsHow it works
Normalize host bits, sort intervals and merge overlaps or adjacency. Convert each merged interval back into aligned CIDRs. Exact aggregation only merges routes when no uncovered gap is introduced.
Worked example
10.42.8.0/25 and 10.42.8.128/25 combine into 10.42.8.0/24. Adding an overlapping /26 does not change that coverage.
Inputs, edge cases & common mistakes
Up to 4096 input prefixes are accepted. Adjacent but misaligned networks may need multiple output routes. Equal address coverage does not guarantee equivalent routing policy: next hops, attributes and more-specific routes still matter.
Technical references
Reviewed 9 September 2026. Found an issue? Send a correction with a reproducible example.