一个B类的IP地址为128.22.25.6，当子网掩码为255.255.255.0时，那么该主机的子网地址、主机号和子网号各是

子网 有效的主机 广播地址
128.22.25.0 , 128.22.25.1 到 128.22.25.254 , 128.22.25.255
128.22.26.0 , 128.22.26.1 到 128.22.26.254 , 128.22.26.255
128.22.27.0 , 128.22.27.1 到 128.22.27.254 , 128.22.27.255
128.22.28.0 , 128.22.28.1 到 128.22.28.254 , 128.22.28.255
128.22.29.0 , 128.22.29.1 到 128.22.29.254 , 128.22.29.255
128.22.30.0 , 128.22.30.1 到 128.22.30.254 , 128.22.30.255
128.22.31.0 , 128.22.31.1 到 128.22.31.254 , 128.22.31.255
128.22.32.0 , 128.22.32.1 到 128.22.32.254 , 128.22.32.255
128.22.33.0 , 128.22.33.1 到 128.22.33.254 , 128.22.33.255
128.22.34.0 , 128.22.34.1 到 128.22.34.254 , 128.22.34.255
128.22.35.0 , 128.22.35.1 到 128.22.35.254 , 128.22.35.255
128.22.36.0 , 128.22.36.1 到 128.22.36.254 , 128.22.36.255
128.22.37.0 , 128.22.37.1 到 128.22.37.254 , 128.22.37.255
128.22.38.0 , 128.22.38.1 到 128.22.38.254 , 128.22.38.255
128.22.39.0 , 128.22.39.1 到 128.22.39.254 , 128.22.39.255
128.22.40.0 , 128.22.40.1 到 128.22.40.254 , 128.22.40.255
128.22.41.0 , 128.22.41.1 到 128.22.41.254 , 128.22.41.255
128.22.42.0 , 128.22.42.1 到 128.22.42.254 , 128.22.42.255
128.22.43.0 , 128.22.43.1 到 128.22.43.254 , 128.22.43.255
128.22.44.0 , 128.22.44.1 到 128.22.44.254 , 128.22.44.255

240.0时
子网 有效的主机 广播地址
128.22.16.0 , 128.22.16.1 到 128.22.31.254 , 128.22.31.255
128.22.32.0 , 128.22.32.1 到 128.22.47.254 , 128.22.47.255
128.22.48.0 , 128.22.48.1 到 128.22.63.254 , 128.22.63.255
128.22.64.0 , 128.22.64.1 到 128.22.79.254 , 128.22.79.255
128.22.80.0 , 128.22.80.1 到 128.22.95.254 , 128.22.95.255
128.22.96.0 , 128.22.96.1 到 128.22.111.254 , 128.22.111.255
128.22.112.0 , 128.22.112.1 到 128.22.127.254 , 128.22.127.255
128.22.128.0 , 128.22.128.1 到 128.22.143.254 , 128.22.143.255
128.22.144.0 , 128.22.144.1 到 128.22.159.254 , 128.22.159.255
128.22.160.0 , 128.22.160.1 到 128.22.175.254 , 128.22.175.255
128.22.176.0 , 128.22.176.1 到 128.22.191.254 , 128.22.191.255
128.22.192.0 , 128.22.192.1 到 128.22.207.254 , 128.22.207.255
128.22.208.0 , 128.22.208.1 到 128.22.223.254 , 128.22.223.255
128.22.224.0 , 128.22.224.1 到 128.22.239.254 , 128.22.239.255
128.22.240.0 , 128.22.240.1 到 128.22.255.254 , 128.22.255.255