ZyXEL Communications P-324 User's Guide download pdf (Page 384)

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P-2602HWNLI User’s Guide

384 Appendix C IP Subnetting

Note: In the following charts, shaded/bold last octet bit values indicate host ID bits

“borrowed” to form network ID bits. The number of “borrowed” host ID bits

determines the number of subnets you can have. The remaining number of

host ID bits (after “borrowing”) determines the number of hosts you can have

on each subnet.

The remaining 7 bits determine the number of hosts each subnet can have. Host IDs of all

zeros represent the subnet itself and host IDs of all ones are the broadcast address for that

subnet, so the actual number of hosts available on each subnet in the example above is 2

– 2

or 126 hosts for each subnet.

192.168.1.0 with mask 255.255.255.128 is the subnet itself, and 192.168.1.127 with mask

255.255.255.128 is the directed broadcast address for the first subnet. Therefore, the lowest IP

address that can be assigned to an actual host for the first subnet is 192.168.1.1 and the highest

is 192.168.1.126. Similarly the host ID range for the second subnet is 192.168.1.129 to

192.168.1.254.

Table 164 Subnet 1

NETWORK NUMBER

LAST OCTET BIT

VALUE

IP Address 192.168.1. 0

IP Address (Binary) 11000000.10101000.00000001. 00000000

Subnet Mask 255.255.255. 128

Subnet Mask (Binary) 11111111.11111111.11111111. 10000000

Subnet Address: 192.168.1.0 Lowest Host ID: 192.168.1.1

Broadcast Address:

192.168.1.127

Highest Host ID: 192.168.1.126

Table 165 Subnet 2

NETWORK NUMBER LAST OCTET BIT VALUE

IP Address 192.168.1. 128

IP Address (Binary) 11000000.10101000.00000001. 10000000

Subnet Mask 255.255.255. 128

Subnet Mask (Binary) 11111111.11111111.11111111. 10000000

Subnet Address:

192.168.1.128

Lowest Host ID: 192.168.1.129

Broadcast Address:

192.168.1.255

Highest Host ID: 192.168.1.254

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