IPv4 Range Expander
The IPv4 Range Expander lists every address in a CIDR or a start-end span, handy for audits, firewalls and tests.
Key Features
- CIDR to list
- Start-end to list
- Large range capped
- Local only
Use Cases
- Audit a firewall rule
- Generate test addresses
- Teach subnetting
- Build a host scan list
How to Use
- Enter the range or CIDR
- Expand
- Copy the addresses
Practical Tips
- Very large ranges are capped for safety
- Use CIDR when possible
- Mind the broadcast ends
FAQ
- Why capped?
- To avoid million-line outputs.
- Start-end vs CIDR?
- CIDR aligns to boundaries; ranges do not.