ZyXEL g-2000 plusv2 Guia Do Utilizador

ZyXEL G-2000 Plus v2 User’s Guide

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The above example illustrated using a 25-bit subnet mask to divide a class “C” address space 
into two subnets. Similarly to divide a class “C” address into four subnets, you need to 
“borrow” two host ID bits to give four possible combinations of 00, 01, 10 and 11. The subnet 
mask is 26 bits (11111111.11111111.11111111.11000000) or 255.255.255.192. Each subnet 
contains 6 host ID bits, giving 2

6

-2 or 62 hosts for each subnet (all 0’s is the subnet itself, all 

1’s is the broadcast address on the subnet). 

Table 143   Subnet 1

IP Address

192.168.1.

0

IP Address (Binary)

11000000.10101000.00000001. 

00000000

Subnet Mask (Binary)

11111111.11111111.11111111. 

11000000

Subnet Address: 192.168.1.0

Lowest Host ID: 192.168.1.1

Broadcast Address: 

192.168.1.63

Highest Host ID: 192.168.1.62

Table 144   Subnet 2

IP Address

192.168.1.

64

IP Address (Binary)

11000000.10101000.00000001. 

01000000

Subnet Mask (Binary)

11111111.11111111.11111111. 

11000000

Subnet Address: 192.168.1.64

Lowest Host ID: 192.168.1.65

Broadcast Address: 192.168.1.127

Highest Host ID: 192.168.1.126

Table 145   Subnet 3

IP Address

192.168.1.

128

IP Address (Binary)

11000000.10101000.00000001. 

10000000

Subnet Mask (Binary)

11111111.11111111.11111111. 

11000000

Subnet Address: 

192.168.1.128

Lowest Host ID: 192.168.1.129

Broadcast Address: 

192.168.1.191

Highest Host ID: 192.168.1.190