IP Aggregation Tool - Network Subnet Optimization

About this tool

Aggregate IPv4 and IPv6 prefixes to consolidate route lists, normalize network IDs, and reduce unnecessary entries before policy or routing table updates.

Enter one address family at a time. The tool supports both IPv4 and IPv6 prefix aggregation.

Tool reference

IP Aggregation

Aggregate IPv4 / IPv6 prefixes into the smallest covering supernets.

Category
addressing
Tags
ipv4, ipv6, supernet

Inputs

  • A list of IPv4 or IPv6 prefixes, one per line
  • Optional toggle: strict aggregation vs. allow gap-merge

Outputs

  • Aggregated prefix list (smallest covering supernets)
  • Count of input vs. output prefixes
  • Notes on adjacencies that could not be merged

Use Cases

  • Shrinking a large prefix-list before announcing upstream
  • Cleaning up overlapping route objects in IRR
  • Reducing churn in vendor configurations

Limitations

  • Pure aggregation — does not consider routing policy or vendor max-prefix
  • Does not pull live BGP data