ZyXEL Communications P-324 User's Guide download pdf (Page 385)

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P-2602HWNLI User’s Guide

Appendix C IP Subnetting 385

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 2

-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 166 Subnet 1

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

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 167 Subnet 2

NETWORK NUMBER

LAST OCTET BIT

VALUE

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 168 Subnet 3

NETWORK NUMBER

LAST OCTET BIT

VALUE

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

1 2 ... 380 381 382 383 384 385 386 387 388 389 390 ... 441 442

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