CalculatorsLesson 151Free preview
IP Range Expander
This lesson is part of Web Developer Tools · All levels
Summary
IP Range Expander converts the CIDR notation or early-end range into a list of IP addresses one by one. The results are useful for compiling allowlist firewalls, checking inventory of devices, or preparing test data. Since a large range can produce millions of lines, always check the size before expanding.
Key points
- CIDR/24 contains 256 addresses, whereas/16 contains 65,536 addresses
- The range can also be written start-end, for example 10.0.0.5-10.0.0.9
- Determine whether network and broadcast are included
- Expand only the range needed to keep output from overloading
- For automation, use a library like ipaddress instead of a manual loop.
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