CIDR

CIDR, or Classless Inter-Domain Routing, is a method used to efficiently allocate and organize IP addresses, which are unique numbers for devices on the internet. Instead of dividing IP addresses into fixed classes, CIDR allows for flexible grouping, saving addresses and improving routing. It combines an IP address with a prefix that indicates how many bits are used for the network part, making it easier for routers to find and direct data. Overall, CIDR helps manage the growing number of internet devices more effectively and reduces address waste.