About Route Summarization Visualizer

Shows how overlapping and adjacent IPv4 or IPv6 routes can be represented as the smallest exact CIDR set. The calculation uses arbitrary-precision address math in the browser and never rounds outward, so the result covers precisely the union of the valid input ranges.

• Normalizes host bits before comparison.
• Keeps IPv4 and IPv6 address families separate.
• Reports duplicates and overlaps while still computing an exact union.

Frequently Asked Questions

Can summarization include addresses outside my inputs?

This tool does not. It merges the exact range union and decomposes that union into aligned CIDR blocks.