ZyXEL VSG-1200 User Manual download pdf (Page 272)

P-660HW-T v2 User’s Guide

Appendix H IP Addresses and Subnetting 272

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.

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 (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

-2 or 62 hosts for each subnet (all zeroes is the subnet itself,

all ones is the broadcast address on the subnet).

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 106 Subnet 2

IP/SUBNET MASK 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

Table 105 Subnet 1 (continued)

IP/SUBNET MASK NETWORK NUMBER

LAST OCTET BIT

VALUE

Table 107 Subnet 1

IP/SUBNET MASK NETWORK NUMBER

LAST OCTET BIT

VALUE

IP Address 192.168.1. 0

IP Address (Binary) 11000000.10101000.00000001. 00000000

Subnet Mask (Binary) 11111111.11111111.11111111. 11000000

1 2 ... 267 268 269 270 271 272 273 274 275 276 277 ... 281 282

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