Class A Continued
127.0.0.1 cannot be used for a host address. It is reserved for the loopback address.
If you ping 127.0.0.1, your internal IP configuration should respond. A successful ping using the loopback address verifies a properly installed TCP/IP protocol suite.
Notice that you cannot create a decimal number higher than 127 with eight binary digits if the first digit must be zero.
For Class A addresses, the InterNIC only assigns the first octet. However, the same is not true for Class B and Class C addresses.