101.18.256.231100.128.10.0211.128.19.255202.104.253.0139.20.255.126163.121.0.255101.18.256.231100.128.10.0211.128.19.255202.104.253.0139.20.255.126163.121.0.255整理了下格式,另外,问题是三部分,1、属于哪一类 2、是否正确 3、子网掩码
255错?确定IP里不能用255?我怎么记得可以呢