Condense address blocks into optimized supernets.
Reduce ACL size by merging contiguous blocks.
This page merges compatible CIDR blocks into a shorter supernet list without changing the existing form or result grid. It is useful when you want cleaner routing or security objects while preserving valid prefix boundaries.
Paste one prefix per line, choose the merge strategy, and review the resulting reduction. Strict modes avoid unnecessary expansion, while broader modes can favor smaller output lists.
The tool checks which prefixes are contiguous and align to a valid shorter prefix, then replaces them with the smallest valid merged representation.
If you enter 10.0.0.0/24 and 10.0.1.0/24, the tool can merge them into 10.0.0.0/23 because the boundaries align cleanly for supernetting.
Use CIDR merge for route summarization, ACL cleanup, and reducing the size of prefix lists before deployment.
The output is prefix math only. A technically valid merge may still be too broad for your routing or security policy.
It combines adjacent or mergeable prefixes into a smaller set of valid supernets when the boundaries allow it.
It is useful for route summarization, ACL cleanup, object group reduction, and easier documentation.
The output follows prefix math. It does not decide whether a broader merged block is acceptable for your routing or security policy.
Validate merged prefixes against existing allocations.
Convert raw ranges before attempting merge or summarization.