2.6. Identifying Classful IP Ranges and Their Subnet Masks
When the Internet and TCP/IP were first developed, 4 billion addresses seemed like an awful lot of addresses and nobody really envisioned running out. For this reason, the founders of the Internet gave some of the larger organizations address spaces that would actually support millions of hosts. Medium-sized companies were later given address spaces that would support thousands of hosts. Small companies were given address spaces that would support hundreds of hosts. No real thought was given to the minimum that an organization could possibly use, because after all we had a "virtually unlimited" supply of addresses, or so we thought.
The addressing scheme that resulted from this is known ...
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