IPv4 CIDR Calculator
Calculate subnet information by entering an IP address with CIDR notation (e.g., 192.168.1.0/24). Get detailed information about network range, usable addresses, and more.
About CIDR Notation
CIDR (Classless Inter-Domain Routing) notation is a compact method for specifying IP addresses and their associated routing prefix. It appends a slash character to the address, followed by the number of leading 1 bits in the routing prefix mask.
- A /32 represents a single IP address
- A /24 typically represents a Class C network (256 addresses)
- A /16 typically represents a Class B network (65,536 addresses)
- A /8 typically represents a Class A network (16,777,216 addresses)