Proxicast LAN-Cell 2 User's Guide download pdf (Page 608)

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Appendix C IP Addresses and Subnetting

LAN-Cell 2 User’s Guide

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Example: Two Subnets

As an example, you have a class “C” address 192.168.1.0 with subnet mask of 255.255.255.0.

The first three octets of the address make up the network number (class “C”).

To make two networks, divide the network 192.168.1.0 into two separate subnets by

converting one of the host ID bits of the IP address to a network number bit. The “borrowed”

host ID bit can be either “0” or “1” thus giving two subnets; 192.168.1.0 with mask

255.255.255.128 and 192.168.1.128 with mask 255.255.255.128.

" In the following charts, shaded/bolded last octet bit values indicate host ID bits

“borrowed” to make 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.

Table 242 Two Subnets Example

IP/SUBNET MASK NETWORK NUMBER HOST ID

IP Address 192.168.1. 0

IP Address (Binary) 11000000.10101000.00000001. 00000000

Subnet Mask 255.255.255. 0

Subnet Mask (Binary) 11111111.11111111.11111111. 00000000

Table 243 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 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 244 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

1 2 ... 603 604 605 606 607 608 609 610 611 612 613 ... 649 650

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