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WAP3205 v3 User’s Guide
88
APPENDIX A
IP Addresses and Subnetting
This appendix introduces IP addresses and subnet masks.
IP addresses identify individual devices on a network. Every networking device (including computers,
servers, routers, printers, etc.) needs an IP address to communicate across the network. These
networking devices are also known as hosts.
Subnet masks determine the maximum number of possible hosts on a network. You can also use subnet
masks to divide one network into multiple sub-networks.
Introduction to IP Addresses
One part of the IP address is the network number, and the other part is the host ID. In the same way that
houses on a street share a common street name, the hosts on a network share a common network
number. Similarly, as each house has its own house number, each host on the network has its own
unique identifying number - the host ID. Routers use the network number to send packets to the correct
network, while the host ID determines to which host on the network the packets are delivered.
Structure
An IP address is made up of four parts, written in dotted decimal notation (for example, 192.168.1.1).
Each of these four parts is known as an octet. An octet is an eight-digit binary number (for example
11000000, which is 192 in decimal notation).
Therefore, each octet has a possible range of 00000000 to 11111111 in binary, or 0 to 255 in decimal.
The following figure shows an example IP address in which the first three octets (192.168.1) are the
network number, and the fourth octet (16) is the host ID.
Figure 63 Network Number and Host ID
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