Supernet Calculator

Aggregate multiple networks into a single supernet for route summarization and efficient routing table management.

Quick Examples

Input Networks

About Supernetting

Supernetting (also called route aggregation or CIDR block aggregation) is the process of combining multiple smaller networks into a single larger network. This technique is essential for:

Reduced Routing Tables

Fewer routes mean faster lookups and reduced memory usage in routers

Improved Scalability

Internet routing scales better with aggregated routes instead of individual subnets

Better Performance

Reduced route advertisements and faster convergence in routing protocols

Easier Management

Simplified network policies and access control lists

When to Use Supernetting

ISP Route Aggregation

Combining customer routes for BGP advertisements

Enterprise Networks

Summarizing branch office networks at headquarters

Data Centers

Aggregating server farm subnets for external advertisement

Network Redesign

Optimizing existing IP allocations for better summarization

Pro Tip

For optimal supernetting, design your IP allocation strategy from the beginning. Contiguous, power-of-2 sized networks aggregate much more efficiently than scattered allocations.