Operation Manual – Network ProtocolH3C S9500 Series Routing Switches Chapter 1 IP Address Configuration1-1Chapter 1 IP Address Configuration1.1 Introduction to IP Addresses1.1.1 IP Address Classification and RepresentationAn IP address is a 32-bit address allocated to a device that accesses the Internet. Itconsists of two fields: net-id field and host-id field. IP addresses are allocated byNetwork Information Center (NIC) of American Defense Data Network (DDN). Tomanage IP addresses conveniently, IP addresses are classified into five types. See thefollowing figure.0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 3101 01 1 01 1 1 01 1 1 1 0net-idnet-idnet-idMulticast addressReserv edhost-idhost-idhost-idClass AClass BClass CClass DClass Enet-id: network ID host-id: Host ID0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 3101 01 1 01 1 1 01 1 1 1 0net-idnet-idnet-idMulticast addressReserv edhost-idhost-idhost-idClass AClass BClass CClass DClass Enet-id: network ID host-id: Host IDFigure 1-1 Five classes of IP addressesHere, Class A, Class B and Class C addresses are unicast addresses, while Class Daddresses are multicast ones and class E addresses are reserved for specialapplications in future. The first three types are commonly used.The IP address is in dotted decimal format. Each IP address contains four integers indotted decimal notation. Each integer corresponds to one byte, for example,10.110.50.101.When using IP addresses, note that some of them are reserved for special uses, andare seldom used. The IP addresses you can use are listed in the following table.
