Class A, 1.0.0.0 to 126.255.255.255 used by governments and a large number of hosts, Class B, 128.0.0.0 to 191.255.255.255 used by medium companies, Class C, 192.0.0.0 to 223.255.255.255 used by small companies and LANs, Class D, 224.0.0.0 to 239.255.255.255 reserved by multicasting, Class E, 240.0.0.0 to 254.255.255.255 experimental

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