Operation Manual –IP Address-IP PerformanceH3C S3100 Series Ethernet Switches Chapter 1 IP Addressing Configuration1-1Chapter 1 IP Addressing Configuration1.1 IP Addressing Overview1.1.1 IP Address ClassesIP addressing uses a 32-bit address to identify each host on a network. An example is01010000100000001000000010000000 in binary. To make IP addresses in 32-bit formeasier to read, they are written in dotted decimal notation, each being four octets inlength, for example, 10.1.1.1 for the address just mentioned.Each IP address breaks down into two parts:z Net ID: The first several bits of the IP address defining a network, also known asclass bits.z Host ID: Identifies a host on a network.For administration sake, IP addresses are divided into five classes, as shown in thefollowing figure (in which the blue parts represent the address class).Figure 1-1 IP address classesTable 1-1 describes the address ranges of these five classes. Currently, the first threeclasses of IP addresses are used in quantity.
