IPv4 Range Expander

Expand CIDR notation or IP address ranges into a complete list of individual IP addresses.

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1. Choose the input mode - CIDR notation (e.g., 192.168.1.0/28) or start-end IP range (e.g., 192.168.1.1-192.168.1.14). 2. Enter the CIDR block or IP range in the input field. 3. Click "Expand" to generate the full list of individual IP addresses within the range. 4. Review the summary showing total address count, network boundaries, and subnet details. 5. Copy the complete address list or download it as a text file for documentation or firewall configuration.

About This Tool

The IPv4 Range Expander takes a CIDR block (like 192.168.1.0/28) or an IP range (like 192.168.1.1-192.168.1.14) and expands it into a full list of individual IP addresses. This is useful for firewall rule auditing, inventory management, and understanding exactly which addresses fall within a given range.

Network administrators frequently need to verify which addresses are included in a CIDR block, especially when configuring access control lists or verifying security policies. This tool eliminates manual calculation by instantly generating the complete address list along with summary information like total count and subnet boundaries.

The tool supports both CIDR notation and arbitrary start-end ranges. For safety, it limits expansion to reasonable block sizes to keep your browser responsive. All processing happens client-side with no data transmitted to external servers.

Frequently Asked Questions

CIDR (Classless Inter-Domain Routing) notation represents an IP address and its associated network prefix. It is written as an IP address followed by a slash and the prefix length, like 10.0.0.0/8. The prefix length indicates how many leading bits define the network.
Yes, for browser performance reasons the tool limits expansion to /16 blocks (65,536 addresses) or smaller. Expanding extremely large blocks could cause your browser to slow down significantly.
This tool generates IP address lists for legitimate network administration tasks such as inventory management, documentation, and firewall rule verification. Always ensure you have authorization before scanning any network.

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