CIDR Calculator
Network Information
Network Address
Broadcast Address
Subnet Mask
Wildcard Mask
First Usable Host
Last Usable Host
Total Addresses
Usable Hosts
Prefix Length
IP Class
Private Range
How to Use
Enter an IPv4 address in CIDR notation (e.g., 192.168.1.0/24). The tool instantly calculates network address, broadcast address, subnet mask, wildcard mask, host range, and total number of usable hosts.
CIDR Notation
CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length separated by a slash. The prefix (0-32) indicates how many bits define the network portion. /24 means the first 24 bits are the network (256 addresses), /16 means 65,536 addresses, and /32 is a single host. CIDR replaced the older classful addressing system.
Privacy
All calculations happen entirely in your browser. No IP addresses or network data is sent to a server, stored, or logged.