CIDR Calculator

Calculate subnet details from an IP address and CIDR notation.

CIDR (Classless Inter-Domain Routing) notation defines IP address ranges and subnet masks in a compact format like 192.168.1.0/24. Our CIDR calculator computes network address, broadcast address, usable host range, subnet mask, and total number of hosts.

Result

Enter an IP/CIDR to calculate.

FAQ

What is CIDR notation?

CIDR notation specifies an IP address and its subnet mask using a prefix length (e.g. /24).