CIDR Summarization Tool

Convert mixed IP addresses, CIDR blocks, and ranges into optimized CIDR prefixes with separate IPv4/IPv6 results.

Summarization Mode

Input Data

Quick Examples

About CIDR Summarization

CIDR Summarization optimizes network routing by combining multiple IP addresses, ranges, and CIDR blocks into the minimal set of CIDR prefixes that covers the same address space.

Route Table Optimization

Reduce routing table size by aggregating multiple routes into fewer, larger prefixes

Network Efficiency

Minimize routing protocol overhead and improve convergence times

Dual Protocol Support

Handle mixed IPv4 and IPv6 inputs with separate optimized outputs

Flexible Input Formats

Process single IPs, CIDR blocks, and explicit ranges in any combination

Summarization Modes

Exact Merge

Conservative approach: Merges overlapping ranges exactly without additional aggregation

Example: 192.168.1.0/24 + 192.168.2.0/24 → 192.168.1.0/24, 192.168.2.0/24
Minimal Cover

Aggressive optimization: Finds the smallest set of CIDR blocks that covers all inputs

Example: 192.168.1.0/24 + 192.168.2.0/24 → 192.168.0.0/23

Common Use Cases

BGP Route Aggregation

Optimize BGP advertisements by summarizing customer routes into provider prefixes

Firewall Rule Optimization

Reduce ACL complexity by consolidating IP ranges into fewer CIDR rules

Network Planning

Analyze address space utilization and optimize subnet allocations

Migration Planning

Consolidate legacy network ranges during infrastructure modernization

Supported Input Formats

Single IP Addresses
192.168.1.100 2001:db8::1
CIDR Blocks
10.0.0.0/8 2001:db8::/32
IP Ranges
172.16.1.1-172.16.1.100 2001:db8::1-2001:db8::ffff
Mixed Lists
One item per line IPv4 and IPv6 together

Optimization Tips

For maximum efficiency, align your network allocations to power-of-2 boundaries. Contiguous address blocks summarize much more effectively than scattered allocations. Use the exact merge mode for conservative summarization or minimal cover for aggressive optimization.