ZyAIR Access Point Series User’s Guide

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.

Example: Four Subnets

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 26-2 or 62 hosts for each subnet (all 0’s is the subnet itself, all 1’s is the broadcast address on the subnet).

Chart K-7 Subnet 1

 

NETWORK NUMBER

 

LAST OCTET BIT VALUE

 

 

 

 

 

 

IP Address

192.168.1.

 

0

 

 

 

 

 

 

 

IP Address (Binary)

11000000.10101000.00000001.

 

 

000000

00

 

 

 

 

 

 

Subnet Mask (Binary)

11111111.11111111.11111111.

 

 

000000

11

 

 

 

 

 

 

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

 

 

 

 

 

 

Chart K-8 Subnet 2

 

 

NETWORK NUMBER

 

LAST OCTET BIT VALUE

 

 

 

 

 

 

 

IP Address

 

192.168.1.

 

64

 

 

 

 

 

 

 

IP Address (Binary)

 

11000000.10101000.00000001.

 

 

000000

 

01

 

 

 

 

 

 

 

Subnet Mask (Binary)

 

11111111.11111111.11111111.

 

 

000000

 

11

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

Chart K-9 Subnet 3

 

NETWORK NUMBER

 

LAST OCTET BIT VALUE

 

 

 

 

 

IP Address

192.168.1.

128

 

 

 

 

 

IP Address (Binary)

11000000.10101000.00000001.

 

 

000000

10

 

 

 

 

 

IP Subnetting

K-5