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Class A IP address ranges: for large networks with many devices (supports 16 million hosts on each of 126 networks). The first octet starts from 1 to 126.
Class B IP address ranges: for medium-sized networks (supports 65,000 hosts on each of 16,000 networks). The first octet starts from 128 to 191.
Class C IP address ranges: for small networks (supports 254 hosts on each of 2 million networks). The first octet starts from 192 to 223.
Class D IP address ranges: multicast addresses. The first octet starts with 224.
Class E IP address: with the first octet of 225 is used for experimental purposes only.
The IP address 127.0.0.1 is used as the loopback address. This means that it is used by the host computer to send a message back to itself. It is commonly used for troubleshooting and network testing.