Routing
Calculated locally
Route Summarization
Enter multiple IPv4 networks, normalize them, remove duplicates and contained blocks, and produce the smallest exact summary set.
Learn how route summarization works
Read the field-focused guide on exact versus covering summaries, alignment, and black-hole prevention.
Summarize IPv4 routes
Enter one CIDR network per line or separate them with commas or spaces.
Mode
When enabled, PacketToolbox finds the smallest single prefix that covers every entered network and warns if it includes extra space.
Action
Results
The summary set is shown below.
Exact summaries
Single covering summary
Normalization details
How it works
Exact summarization rules
PacketToolbox follows strict route-aggregation rules so every output route is safe.
Normalize first
Every entry is converted to its true network address before any summarization logic runs.
Remove redundancy
Duplicate networks and networks already contained by a wider input are discarded.
Merge only when exact
Two blocks may merge only if they share the same prefix, are adjacent, and align to a valid parent prefix.
Stay inside the entered space
If a merge would spill into unused address space, it is rejected.