Just a little smile ^ ^
IP
A类 NHHH (0-126)(0-255)(0-255)(0-255) 126个网络,每个网络有256*256*256个主机
B类 NNHH (128-191)(0-255)(0-255)(0-255) 64*256个网络,每个网络有256*256个主机
C类 NNNH (192-222)(0-255)(0-255)(0-255) 31*256*256个网络,每个网络有256个主机
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