IP Addressing and Subnetting
Calculated locally
Host Capacity Calculator
Determine the smallest IPv4 prefix that satisfies host requirements and estimate wasted capacity.
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 required host count to get recommended prefix, mask, and utilization math.
All processing runs in-browser with no external API dependency.
Practical example
Example: 120 hosts recommends /25 with 126 usable addresses.
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.