Supernet Summarisation
Enter two IPv4 CIDR networks to calculate their smallest exact covering network locally.
A QUICK WALKTHROUGH
How to use this tool
- Enter two IPv4 CIDR networks.
- Summarise them and review the covering range.
- Compare announced and covered addresses and efficiency.
Exact CIDR only
Both inputs must be canonical IPv4 CIDR networks. The tool returns a supernet only when the two ranges are equal-sized, adjacent, and aligned to the resulting prefix.
Local and bounded
Only two textual IPv4 networks are parsed. No routing table or network service is consulted; invalid, overlapping, non-adjacent, or differently sized ranges are rejected.
GOOD TO KNOW
Common questions
Does it summarise arbitrary ranges?
No. It combines exactly two equal-size adjacent CIDR networks.
What is efficiency?
It compares the two announced addresses with the single summarised address.
Does it connect to the network?
No. Calculation is entirely local.