CIDR Aggregator

Merge and summarize multiple adjacent, overlapping, or redundant IPv4 CIDR blocks (e.g. `192.168.0.0/24` and `192.168.1.0/24` -> `192.168.0.0/23`) into the absolute minimal set of subnets.

Why Use This Tool?

• BGP Route Summarization: Summarize long lists of IP subnets into compact routing table entries.
• Firewall Rule Cleanup: Consolidate hundreds of individual IP subnet rules into minimal CIDR lists for Cloudflare, AWS, or iptables.
• Network Optimization: Eliminate redundant overlapping IP entries.

How to Use

1. Paste a list of IPv4 addresses or CIDR subnets (one per line or comma-separated).
2. Click "Aggregate CIDR Blocks".
3. View collapsed minimal CIDR list and percentage reduction ratio.

Real Working Example

Input:

Subnets:
192.168.0.0/24
192.168.1.0/24
192.168.2.0/24
192.168.3.0/24

Output Result:

Aggregated CIDR Result: 192.168.0.0/22 | Reduction: 4 rules reduced to 1 optimal rule (-75%)

Important Technical Details & Standards

• Trie / Binary Tree Aggregation Algorithm: Builds a binary prefix trie to merge contiguous power-of-two sibling subnets.
• Redundant Subnet Pruning: Automatically strips smaller subnets that are completely contained within larger subnets.
• Client-Side Engine: Fast local calculation in browser memory.

Related Networking & Security Tools

• IPv4 Subnet Calculator: Calculate IPv4 subnets.
• IPv4 Range Expander: Convert IP ranges to CIDR.
• VLSM Calculator: Allocate variable-length subnets.