IPv4 Range Expander Online — List All IPs in CIDR Block

What is IPv4 Range Expander Online?

Network engineers and security professionals frequently need to enumerate every individual IP address within a specific network segment. Whether you are generating access control lists (ACLs) for a firewall, preparing a target list for a security scan, or documenting the static IP assignments in a small office, our IPv4 range expander online tool makes the task effortless. It can expand any standard CIDR notation (like 10.0.0.0/28) or a simple start-and-end address range into a complete, newline-delimited list. The expander intelligently calculates the network boundaries for you. For a /28 block, it will correctly identify all 16 total addresses, or you can choose to skip the network and broadcast addresses to see only the usable host IPs. This level of automation prevents the common manual calculation errors that lead to broken network connectivity or security gaps in firewall rules. All calculations are performed instantly in your browser browser. You can quickly copy the resulting list for use in your scripts, configuration files, or network documentation. It is an essential companion for anyone working with AWS VPCs, local server clusters, or complex enterprise network architectures where hundreds of addresses must be managed precisely.

How to Use IPv4 Range Expander Online

1. Enter a CIDR block (e.g., 192.168.1.0/24) or a range with a hyphen (e.g., 10.0.0.1-10.0.0.25).
2. Select the output format (newline or comma-separated).
3. The full list of expanded IP addresses is generated instantly for you to copy.

Developer Tips

If you are building a tool that needs to scan large network ranges, avoid listing every IP in a string array. Instead, use a loop that increments the 32-bit integer representation of the IP to save memory and processing time.

Frequently Asked Questions