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Network classes were completely replaced by new Internet addressing architecture - CIDR (classless inter - domain routing) in early 2000's. It allows to assign only required number of IP addresses to organisation, not the entire network class. CIDR notation consists of IP address and the routing prefix - slash "/" followed by the number. This number is a network mask, showing how many bits of an IP address defines a range: "/24" is an equivalent of C class network. There are IP ranges assigned to some organizations long time ago, so term "IP classes" is still sometimes used. We only provide IP addresses with different first octet, so you know for sure they are on a different networks.