IPv4 Range Expander

CIDR (Classless Inter-Domain Routing) notation specifies an IP address and its associated network prefix length. For example, 192.168.1.0/24 means the first 24 bits are the network portion, leaving 8 bits (256 addresses) for host addresses.

The network address is the first IP in a subnet (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 data to all hosts on the network. Neither can be assigned to a host.

Usable host addresses are all IPs in a subnet excluding the network address (first) and broadcast address (last). For a /24 subnet with 256 total addresses, there are 254 usable host addresses (from .1 to .254).

A subnet mask is a 32-bit number that separates the network and host portions of an IP address. For example, /24 gives a subnet mask of 255.255.255.0, meaning the first three octets identify the network.

Yes — enter a range like 192.168.1.10-192.168.1.20 and the tool will calculate all IPs between the start and end addresses. Both CIDR notation and dash-separated ranges are supported.