I think you mean subnet per network.
Lets See an example for Class B:
We know that in class B network the first two bits are 1 0. Next forteen bit represent the network and last sixteen identify the host.
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Therefore class B address include the network nubers in the range from 188.8.131.52 through 184.108.40.206 for a total 65,534 number of host address
We divide the host portion of a Class B into subnet and host parts. For instance, let’s split our Class B network number on the bytes. The eight MSBs of the host portion defined the subnet and the remaining bits the host.
Network Subnet Host
+—————–+ +———+ +——–+
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This arrangement allows 254 subnets each with 254 hosts.