CIDR Aggregator
Summarise IPv4 networks
The CIDR aggregator merges a list of networks into as few blocks as possible. Adjacent and contained networks are combined – ideal for cleaning up firewall rules, routing tables or access lists.
- Merge: Two adjacent /24s become a single /23, for example.
- Contained: A /24 inside a /16 disappears into the larger block.
- Input: CIDR notation (
10.0.0.0/24) or individual IPs (treated as /32), one per line.