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Appendix B IP Addresses and Subnetting

FSG1100HN User’s Guide

115

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.

Network Number and Host ID

How much of the IP address is the network number and how much is the host ID

varies according to the subnet mask.

Subnet Masks

A subnet mask is used to determine which bits are part of the network number,

and which bits are part of the host ID (using a logical AND operation). The term

“subnet” is short for “sub-network”.

A subnet mask has 32 bits. If a bit in the subnet mask is a “1” then the

corresponding bit in the IP address is part of the network number. If a bit in the

subnet mask is “0” then the corresponding bit in the IP address is part of the

host ID.

The following example shows a subnet mask identifying the network number (in

bold text) and host ID of an IP address (192.168.1.2 in decimal).

Subnet Mask - Identifying Network Number

1ST

OCTET:

(192)

2ND

OCTET:

(168)

3RD

OCTET:

(1)

4TH

OCTET:

(2)

IP Address (Binary)

11000000

10101000

00000001

00000010

Subnet Mask (Binary)

11111111

00000000

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 182 183

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ZyXEL Communications Network Router wireless active fiber router Manual de usuario Pagina 115