Route Summarization Calculator
Combine multiple contiguous IPv4 subnets into a single, efficient supernet (route aggregation) to drastically reduce routing table sizes and improve network performance.
Supernetting Calculator
Networks to Summarize
Example Input:
192.168.0.0/24
192.168.1.0/24
192.168.2.0/24
192.168.3.0/24
192.168.1.0/24
192.168.2.0/24
192.168.3.0/24
Enter ≥ 2 valid networks in CIDR notation
Route Summarization Results
Summary Network Details
| Summary Network | First Usable IP | Last Usable IP | Broadcast | Total Usable Host | Total Available Host | Netmask | Wildcard |
|---|
Individual Networks
| Network | First Usable IP | Last Usable IP | Broadcast | Total Usable Host | Total Available Host | Netmask | Wildcard |
|---|
How to Use the Route Summarization Calculator
Route summarization (also known as Supernetting) takes multiple contiguous smaller networks and consolidates them into a single larger network address to minimize routing table entries.
- Enter your Networks: Type or paste at least 2 subnets in CIDR notation into the text area. You must place exactly one network per line (e.g.,
192.168.0.0/24). - Ensure Contiguity: The tool requires the IP addresses to be contiguous (sequential). If there are gaps in your IP blocks, the mathematical summarization will fail.
- Calculate: Click the "Calculate" button to immediately compute the shortest possible prefix that fully encompasses all provided routes.
- Review the Results: The primary table will display your newly created Summary Route (Supernet). The secondary table will verify the specific details of every individual network you inputted.
Example Calculation
If you input four contiguous /24 networks (192.168.0.0/24 through 192.168.3.0/24), the calculator will aggregate them into a single /22 supernet:
| Summary Network | First Usable IP | Last Usable IP | Broadcast | Total Usable Host | Total Available Host | Netmask | Wildcard |
|---|---|---|---|---|---|---|---|
| 192.168.0.0/22 | 192.168.0.1 | 192.168.3.254 | 192.168.3.255 | 1022 | 1024 | 255.255.252.0 | 0.0.3.255 |