Ip Address Overview; Chapter 1 Ip Address Configuration - 3Com 3C13636 Configuration Manual

Router 3000 ethernet family

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3Com Router 3000 Ethernet Family

Configuration Guide

1.1 IP Address Overview

IP addresses are unique 32-bit addresses assigned to hosts connected to Internet. An

IP address is composed of two parts: network ID and host ID. Its structure enables

convenient addressing on Internet. IP addresses are assigned by Network Information

Center (NIC) of American National Defense Data Network.

IP address consists of the following fields:

Network ID field (net-id), among which the former bits are called the category field

(or category bits) used to distinguish the types of IP addresses.

Host ID field (host-id). Since host number with all 1s or 0s has special usage, it is

specified that the host number should not be all 1s or 0s.

For easy IP address management and convenient networking, IP address of Internet is

divided into five classes. As shown in the following diagram:

Figure 1-1 Classification of IP address

Address of class D is a multicast address, mainly used by IAB (Internet Architecture

Board). Address of class E is reserved for future use. At present, Most IP addresses are

class A, class B and class C.

When using IP addresses, it should also be noted that some of them are reserved for

special uses, and are seldom used. The IP addresses you can use are listed in the

following table.

net-id — Network number

3Com Corporation

Chapter 2 IP Address Configuration

Multicast address

Reserved for future use

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