In the article, "Net Surfing with IP Protocol"
in the section called "Classes of IP Addresses"
in the 3rd paragraph, first line, it states :

[Class B networks (where high-order bits are set binary 01, see Figure 3)]
The "Figure 3" is wrong too.

I believe that the high order bits for a Class B network are to be 10 and not 01.
Only a high order bits of 10 can give a value of 128 to the 1st available class b network address.

A high order bit of "01" as stated in the article is incorrect and not available for class B since it gives a value of 64 that is in reality part of the Class A network address pool.

Sincerely,

Roberto Gelleni