4-1
4
IP Addressing Configuration
This chapter includes these sections:
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z
z
Displaying and Maintaining IP Addressing
IP Addressing Overview
This section covers these topics:
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IP Address Classes
On an IP network, a 32-bit IP address is used to identify a host. In general, IP addresses are written in
dotted decimal notation, for example, 10.1.1.1.
Each IP address has two parts:
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Net ID: Identifies a network.
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Host-id: Identifies a host on a network.
IP addresses are divided into five classes, as shown in the following figure (the blue parts represent
the address class fields).
Figure 4-1
IP address classes
0
Net-id
Host-id
1
Net-id
Host-id
0
1
Net-id
Host-id
0
1
1
Multicast address
0
1
1
1
Reserved
1
1
1
Class A
Class B
Class C
Class D
Class E
0
7
15
23
31
0
describes the address ranges of these five classes.
