1

Say we have the the IP address 10.2.8.230/24

Anyone could say the following:

It just represents a normal network:10.2.8.0/24

Or it is a subnet because normally this IP address is in the class A range,so that is 2^16 subnetworks

Or even,perhaps it is a supernet(not sure about this one(!))

How do we tell those apart?

  • I would understand it to mean "the address is 10.2.8.230 and the mask is 255.255.255.0" – jonathanjo May 2 at 13:11
  • Everything you wanted to know about IPv4 addressing is in this answer. – Ron Maupin May 2 at 14:16
6

IP address classes have been obsolete since before you were born. Subnet and supernet are in relation to other networks. So 10.2.8.0/24 is a subnet of 10.2.0.0/16, but a supernet of 10.2.8.16/28.

EDIT

Because address classes are no longer used, there aren't different types of masks. A network mask (also commonly called a subnet mask) simply defines the network and host portions of the address.

Also, the concept of "subnet bits" or "subnet ID" is similarly obsolete.

  • If we had this address: 195.167.1.0/25 , then how would i know what the previous mask was?It could be /16 so the subnet id is 9 bits ,or, /24 and so the subnet id was given just one bit.Can you really distinguish the original mask? – Zach May 2 at 10:50
  • 2
    There is no 'previous mask' or 'original mask' concept. – Teun Vink May 2 at 11:29
  • 2
    Just to add to the confusion, the term "subnet" is also used generally for any network segment. – Ron Trunk May 2 at 12:30

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