What does BGP Prefix & Aggregation Calculator do?

Calculate BGP prefix aggregation, CIDR boundaries, route advertisement planning, and summarization values.

Network engineers, sysadmins, DevOps teams, security learners, and technical operators can use this browser-based workflow.

BGP Routing Intelligence

Calculate aggregate prefixes, subnet counts, and route advertisement boundaries for border gateway protocol optimizations.

Parent IP

Parent Mask

Subnet Mask

Total /24s 256

Total Hosts 65k

Address Range & Boundaries

10.0.0.0 - 10.0.255.255

Wildcard: 0.0.255.255

Aggregation & Summary

BGP Aggregation (or summarization) is the process of combining multiple specific routes into a single broader route to reduce the size of routing tables. This is crucial for ISP-scale networks to maintain stability and performance.

Boundary Logic: For a prefix to be aggregatable, the constituent subnets must be contiguous. For example, two `/24` subnets (10.0.0.0/24 and 10.0.1.0/24) can be aggregated into a single `10.0.0.0/23` route.

Route Flapping: Summarization also hides "flaps" (routes going up and down frequently) from the rest of the internet, as the summary route remains stable as long as at least one specific route is active.