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Calculate network address, broadcast, usable IP range, and host count from IP address and CIDR prefix. Supports IPv4 and IPv6.
Enter the IP address and prefix length in CIDR notation (e.g., 192.168.1.0/24, 2001:db8::/32).
Network address, broadcast address, usable IP range, host count, and more are calculated automatically.
Click the copy button next to each result to copy the value to your clipboard.
Enter a CIDR notation (e.g., 192.168.1.0/24) to calculate
A tool for calculating subnet information from IP address and CIDR prefix. Useful for network design and troubleshooting.
CIDR (Classless Inter-Domain Routing) is a notation method that separates an IP address and its network prefix length with a slash. For example, "192.168.1.0/24" indicates that the first 24 bits are the network portion.
IPv4 uses 32-bit addresses (e.g., 192.168.1.0), while IPv6 uses 128-bit addresses (e.g., 2001:db8::). IPv6 was designed to address the exhaustion of IPv4 addresses.
A subnet defined in RFC 3021 for point-to-point links. In normal subnets, two IPs are reserved for the network and broadcast addresses, but in a /31, both IP addresses can be used as hosts.