IP Range Expander - Expand CIDR Blocks to Full IP Lists Online
Expand CIDR subnets (e.g. 192.168.1.0/24) and start-end IP ranges into complete lists of individual IP addresses.
This tool runs in your browser.
Enter an IPv4 range.
How to use
- 01Enter a start and end IPv4 address.
- 02Expand up to 256 addresses locally.
FAQ
What is CIDR notation and how is total IP count determined?
CIDR denotes subnet masks with prefix lengths (e.g., /24). Total IPs equal 2^(32 - prefix); a /24 block contains exactly 256 IP addresses.
Can this tool safely expand large blocks like /16 without crashing?
Yes. Chunked calculation and safety limits prevent memory spikes when generating massive lists containing tens of thousands of addresses.
Does the tool send network packets or ping addresses?
No. IP expansion is strictly arithmetic string manipulation performed client-side inside your browser sandbox without network calls.