>_ CIDR Calculator

Calculate network details from a CIDR notation

// cidr notation

network192.168.1.0

broadcast192.168.1.255

first host192.168.1.1

last host192.168.1.254

subnet mask255.255.255.0

total hosts254

// learn

CIDR (Classless Inter-Domain Routing) notation represents an IP address and its subnet mask, e.g. 192.168.1.0/24. The /24 indicates that the first 24 bits are the network prefix. CIDR replaced classful addressing to allow more efficient allocation of IP addresses and is fundamental to modern IP networking.