问题3:202.96.44.88
问题4:
子网掩码:255.255.255.224
202.96.44.0 - 202.96.44.31
202.96.44.32 - 202.96.44.63
202.96.44.64 - 202.96.44.95
202.96.44.96 - 202.96.44.127
202.96.44.128 - 202.96.44.159
202.96.44.160 - 202.96.44.191
202.96.44.192 - 202.96.44.223
202.96.44.224 - 202.96.44.255