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IPv4 Range Expander

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IPv4 Range Expander

The IPv4 Range Expander takes a CIDR notation range (like 192.168.1.0/24) and expands it into a complete list of every individual IP address in that range. This is useful for network administrators, security professionals, and anyone who needs a full enumeration of IPs within a subnet for firewall rules, access control lists, or network scanning.

Como usar

Enter one or more CIDR ranges in the input field, one per line (e.g., 192.168.1.0/28). Select your preferred output format — one IP per line, comma-separated, or JSON array. Click Expand to generate the full list of IP addresses. Copy the result or download it as a text file.

Características

CIDR Expansion – Converts any valid CIDR notation into a complete list of IP addresses
Multiple Ranges – Enter several CIDR ranges at once, one per line
Output Formats – Choose between newline-separated, comma-separated, or JSON array output
Copiar e baixar – Instantly copy the result or download as a text file
IP Count – Shows the total number of expanded IP addresses

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 Perguntas frequentes

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation is a method for representing IP address ranges using a base IP address followed by a slash and prefix length (e.g., 192.168.1.0/24). The prefix length indicates how many bits of the address are the network portion, and the remaining bits define the host range.
How many IP addresses does each prefix length contain?

The number of IPs in a CIDR range is 2 raised to the power of (32 minus the prefix length). For example, /24 contains 256 addresses, /28 contains 16, /16 contains 65,536, and /32 is a single host address.
What is the difference between network address and broadcast address?

The network address is the first IP in a subnet range (all host bits set to 0) and identifies the network itself. The broadcast address is the last IP (all host bits set to 1) and is used to send packets to all hosts on that subnet. Neither is typically assigned to a device.