ZyXEL Access Point G1000 v2 91-005-124001B Benutzerhandbuch

ZyXEL G-1000 v2 User’s Guide

156

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

7

 – 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 70   Subnet 1

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 71   Subnet 2

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