ZyXEL VSG-1200 User Manual download pdf (Page 268)

VSG-1200 User’s Guide

268 Appendix H IP Subnetting

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 101 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 102 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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ZyXEL VSG-1200 User Manual Page 268