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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.