IP Range Expander
Expand an IP address range into a list of individual addresses. Useful for network planning and firewall rules. Code never leaves your device — formatting and validation run locally in your browser.
How to Use the IP Range Expander
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Frequently Asked Questions
CIDR to list?
Yes — /24 becomes 256 addresses, while larger blocks paginate output as needed.
IPv6 ranges?
Compressed notation expands correctly per RFC 4291 rules always.
Why expand at all?
Firewall rules, allowlists, and scan targets need explicit addresses.
Is my ranges uploaded anywhere when using IP Range Expander?
No — expansion runs locally in your browser, free with no signup.
What are the range caps?
End before start errors; spans over 65536 addresses are refused outright. Count is end - start + 1, but only the first 256 addresses (up to start + 255) render - the rest collapse to a ... N more line. The shown list downloads as ip-range.txt.
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Last updated October 2026