ZyXEL P-2812HNU-51c User Manual download pdf (Page 456)

100

101

Appendix D IP Addresses and Subnetting

P-2812HNU-51c User’s Guide

456

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 219 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).

Table 143 IP Address Network Number and Host ID Example

1ST

OCTET:

(192)

2ND

OCTET:

(168)

3RD

OCTET:

(1)

4TH

OCTET

(2)

IP Address (Binary) 11000000 10101000 00000001 00000010

Subnet Mask (Binary) 11111111 11111111 11111111 00000000

Network Number 11000000 10101000 00000001

Host ID 00000010

1 2 ... 451 452 453 454 455 456 457 458 459 460 461 ... 521 522

Comments to this Manuals

No comments

ZyXEL P-2812HNU-51c User Manual Page 456

Comments to this Manuals

Related products and manuals for Networking ZyXEL P-2812HNU-51c