CIDR Calculator
Enter an IP address and CIDR prefix to see the expanded subnet parameters. Use the CIDR dropdown to quickly convert between prefixes. CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length into a compact format like 192.168.1.0/24. The prefix /24 indicates that 24 bits are used for the network portion, leaving 8 bits for host addresses. This calculator supports all prefixes from /0 to /32 and provides instant results for network address, broadcast, subnet mask, wildcard mask, and usable host count.
How to Use the CIDR Calculator
Accepts IP/CIDR, IP Mask, or IP/MASK formats
CIDR Notation Reference
CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length: 192.168.1.0/24. The /24 means 24 bits are allocated to the network portion, leaving 8 bits for hosts.