CIDR Aggregator
Compute a covering supernet for multiple CIDR blocks.
CIDR Aggregator combines adjacent CIDR blocks into the smallest valid summary routes. Route aggregation works only when blocks are contiguous and aligned on binary prefix boundaries; two neighboring /25 networks can become one /24, but arbitrary nearby ranges may not summarize cleanly. Aggregation reduces routing-table size and simplifies firewall or ACL policy, but it can also include addresses that were not intended if the summary is too broad. This tool is useful for route planning, cloud allowlists, and network documentation because it shows which prefixes can be represented compactly. Always confirm summarized routes against ownership, security policy, and live routing behavior before deployment.