IP Addressing

 

1 Networking Overview

192

168

50

75

11000000

10101000

00110010

01001011

192

168

50

91

11000000

10101000

00110010

01011011

192

168

50

100

11000000

10101000

00110010

01100100

Subnet mask 255

255

255

224

11111111

11111111

11111111

11100000

 

27 digits

 

 

Class-A and Class-B subnets

The other four possible subnetting schemes for Class C addresses, using 2, 4, 5, and 6 subnet bits, are formed in the same way. Which of the 5 subnetting schemes to use depends on the requirements for the number of subnets and the number of hosts per subnet.

For Class A and Class B IP addresses, subnets can be formed in the same way as for Class C addresses. The only difference is that many more subnets per network can be formed. For Class B networks, subnets can be formed using from 2 to 14 bits from the 3rd and 4th octets. For Class A networks, subnets can be formed using from 2 to 22 bits from the 2nd, 3rd and 4th octets.

The Subnet Mask field on the ppp Data Module screen (used for ppp connections) and on the IP Interfaces screen (used for ethernet connections) enables the specification of a subnet for the IP address.

 

 

Administration for Network Connectivity

20

CID: 77730

555-233-504 — Issue 1 — April 2000

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Image 40
Lucent Technologies Release 8.2 manual Subnet mask, 255 224, 11100000, Digits, Class-A and Class-B subnets