BGP Prefix-List Generator

Automatically aggregate and compress a list of IP prefixes into a mathematically equivalent set of BGP prefix-lists. Uses lossless ge/le boundaries to reduce configuration size without accidentally permitting unauthorized subnets.

Input CIDR Blocks

Paste the exact IPv4 subnets (e.g., 10.0.0.0/24) you want to permit.

Output Syntax

Permissive Mode (le 32)

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Paste your IPv4 CIDR blocks above and click Generate Prefix-List
to calculate the optimal configuration.