IP Addressing and Subnetting
Calculated locally
IP Range Calculator
Calculate address count, smallest covering prefix, and exact CIDR decomposition for IPv4 start and end ranges.
Learn before you deploy
Reference PacketToolbox learning content related to this workflow.
Tool input
Use the fields below and run the calculation or generation locally.
Results
Review output and validation notes before production use.
How it works
Enter start and end IPv4 addresses to decompose the exact range into valid CIDR blocks.
All processing runs in-browser with no external API dependency.
Practical example
Example: 10.10.10.4 to 10.10.10.190 produces an exact multi-CIDR decomposition.
Related tools
Use these together for complete design and troubleshooting workflows.
- IPv4 Subnet Calculator for subnet boundary and wildcard checks.
- VLSM Planner for hierarchical IPv4 allocation.
- Route Summarization Calculator for clean route advertisement planning.
- Cisco ACL Builder for policy-generation workflows.