is host id size of IP address will vary between the private and public networks?

Question

I understood that size of host id in the class c network is 8 bits(1 Octet)

Classful network

After started exploring about private networks, in the below link

Private network

The host id size of the IP address range belongs to the class C network is mentioned in as 16 byte

 192.168.0.0 - 192.168.255.255 (16-bit block private address)

My Assumption:

1. Class full network is applied for both private and public IP addresses. That is ifthe IP starts with 192.168.x.x is class c network and the size of the host id in the class full network is always 8(1 octet).

Is my assumption is wrong or any theory behind it?

Answer 1

1. The Classes were deprecated in 1994. That's 20 years ago. Everything is done in VLSM using CIDR notation. What was a "Class C" is now a "/24".
2. The 192.168 RFC 1918 allocation is a /16, as noted in the "16-bit block" remark.
3. Your assumptions are based on something that was abandoned 20+ years ago.