IP V4地址共分爲五類:
A類地址範圍:1.0.0.1---126.255.255.254
B類地址範圍:128.0.0.1---191.255.255.254
C類地址範圍:192.0.0.1---223.255.255.254
D類地址範圍:224.0.0.1---239.255.255.254
E類地址範圍:240.0.0.1---255.255.255.254