Everybody heared about the IPV4 getting consumed due alot of people in the world need it. But for this purpose, we have NAT, which do atchually port forwording to inside "unreal" ips.. (10.\196.168.).
In this article:
there is the next paragraph:
Because Class A, B, and C default Masks (255.0.0.0, 255.255.0.0, 255.255.255.0) respectively were not an efficient approach to identify Network bits. So, in the the beginning of the 90’s, the default Netmask approach was not efficient due to releasing BIG Blocks of IP Addresses to the Public. Using just default Masks would have made the IP Space consumed long time ago. Therefore, Subnet Masks were evolved to distribute the IP space more efficiently, hence, smaller Blocks can be released to save the rest of the IP Space, which made it possible to have the Internet available to everyone back then.
Which actually saies that subnet is what anwer the consuming IPV4 problem. Can you order my mind please?
With subnet I can devide inside network. but why it have any relation for saving ips?