Issue
Classless IP addressing means that the IP address and the SUBNET mask of the device can belong to different classes.
There are three classes of IP addresses: A, B, and C. Each class covers a different of the range of the first octet of the IP Addresses:

Class A: 1-126

Class B: 128-191

Class C: 192-223

For example, 192.168.1.1 is a class C  and 126.168.68.10 is class A IP address.

The classes for the Subnet mask is a little different. The classes are as follows:

Class A: 255.0.0.0

Class B: 255.255.0.0

Class C: 255.255.255.0

It is possible to use a Subnet that is greater than the minimum values listed above. However, it would be inconsistent to use a Subnet lower than those values.

Below are examples of appropriate and inappropriate examples of IP/Subnet pairs:

Right: IP 10.168.68.10 Subnet 255.0.0.0

Right: IP 10.168.68.10 Subnet 255.255.248.0

Wrong: IP 192.168.1.1 Subnet 255.0.0.0

Product Line
ION Meters

Environment
IP Addressing

Resolution
ION Meters support classless IP addressing.

Released for: Schneider Electric Egypt and North East Africa