IPv4 Range Expander
Expand a CIDR block or an IP start–end range into a list of individual IPv4 addresses. Supports ranges up to 1,024 addresses.
DevForge is free and ad-supported. Buy me a coffee if it saved you time.
How to Use This Tool
Choose CIDR mode to expand a network block (e.g. 192.168.1.0/28), or Range mode to expand between a start and end IP. Click Expand to list all addresses. Results are capped at 1,024 for performance.
Common Use Cases
- Audit which IPs are allocated in a network block
- Generate test data with sequential IP addresses
- Verify the size of a subnet before assignment
- Check overlap between two IP ranges
Frequently Asked Questions
What is the maximum number of addresses expanded?
This tool displays up to 1,024 addresses to avoid browser slowdowns. For larger ranges, it shows the total count and the first 1,024 addresses.
What CIDR ranges can I enter?
Enter any valid IPv4 CIDR notation such as 10.0.0.0/24 or 192.168.1.128/25. Prefix lengths from /0 to /32 are supported.
Can I enter a start–end range instead of CIDR?
Yes. Switch to Range mode and enter a start IP and end IP. The tool will expand every address between them inclusive.