IP地址表示方法及网段子网掩码写法ip地址怎么写子网掩码

A类IP段　0.0.0.0到127.255.255.255
B类IP段　128.0.0.0到191.255.255.255
C类IP段　192.0.0.0到223.255.255.255

　　ＸＰ默认分配的子网掩码每段只有255或0

　　Ａ类的默认子网掩码　255.0.0.0　　　　　一个子网最多可以容纳1677万多台电脑
　　Ｂ类的默认子网掩码　255.255.0.0　　　　一个子网最多可以容纳6万台电脑
　　Ｃ类的默认子网掩码　255.255.255.0　　　一个子网最多可以容纳254台电脑

子网掩码&IP地址=网络标识
如果网络标识一样，那么属于同一网段
例子192.168.0.n255.255.255.0由于前面都一样n&1肯定等于0那么肯定属于同一网段。
同时子网掩码决定了一个网段可以连多少台机器。
例如子网掩码为255.255.255.011111111.11111111.11111111.00000000
计算机公式是2的m次方，其中，我们可以把m看到是后面的多少颗0

如何设置机器ip使机器属于同一网段；如果子网掩码255.255.252.011111111.11111111.11111100.00000000
255-252=3.
ip第2组（右往左）地址可以分别为00，01，10，11;因为这些值和00求余都等于0


IP标识法
一个完整IP描述包含IP地址和子网掩码
具体标识有两种
192.168.0.n255.255.255.0
192.168.0.n/24
/24表示子网掩码二进制标识法中前面24位1

IP总数子网掩码C段个数/304255.255.255.2521/64/298255.255.255.2481/32/2816255.255.255.2401/16/2732255.255.255.2241/8/2664255.255.255.1921/4/24256255.255.255.01/23512255.255.254.02/221024255.255.252.04/212048255.255.248.08/204096255.255.240.016/198192255.255.224.032/1816384255.255.192.064/1732768255.255.128.0128/1665536255.255.0.0256

24--1Subnets--254Hosts/Subnet
代表一整个C段

网络地址可用IP范围广播地址.0.1-.254.255

/25--2Subnets--126Hosts/Subnet

网络地址可用IP范围广播地址.0.1-.126.127.128.129-.254.255

26--4Subnets--62Hosts/Subnet

网络地址可用IP范围广播地址.0.1-.62.63.64.65-.126.127.128.129-.190.191.192.193-.254.255

/27--8Subnets--30Hosts/Subnet

网络地址可用IP范围广播地址.0.1-.30.31.32.33-.62.63.64.65-.94.95.96.97-.126.127.128.129-.158.159.160.161-.190.191.192.193-.222.223.224.225-.254.255

/28--16Subnets--14Hosts/Subnet

网络地址可用IP范围广播地址.0.1-.14.15.16.17-.30.31.32.33-.46.47.48.49-.62.63.64.65-.78.79.80.81-.94.95.96.97-.110.111.112.113-.126.127.128.129-.142.143.144.145-.158.159.160.161-.174.175.176.177-.190.191.192.193-.206.207.208.209-.222.223.224.225-.238.239.240.241-.254.255

/29--32Subnets--6Hosts/Subnet

网络地址可用IP范围广播地址.0.1-.6.7.8.9-.14.15.16.17-.22.23.24.25-.30.31.32.33-.38.39.40.41-.46.47.48.49-.54.55.56.57-.62.63.64.65-.70.71.72.73-.78.79.80.81-.86.87.88.89-.94.95.96.97-.102.103.104.105-.110.111.112.113-.118.119.120.121-.126.127.128.129-.134.135.136.137-.142.143.144.145-.150.151.152.153-.158.159.160.161-.166.167.168.169-.174.175.176.177-.182.183.184.185-.190.191.192.193-.198.199.200.201-.206.207.208.209-.214.215.216.217-.222.223.224.225-.230.231.232.233-.238.239.240.241-.246.247.248.249-.254.255

/30--64Subnets--2Hosts/Subnet

网络地址可用IP范围广播地址.0.1-.2.3.4.5-.6.7.8.9-.10.11.12.13-.14.15.16.17-.18.19.20.21-.22.23.24.25-.26.27.28.29-.30.31.32.33-.34.35.36.37-.38.39.40.41-.42.43.44.45-.46.47.48.49-.50.51.52.53-.54.55.56.57-.58.59.60.61-.62.63.64.65-.66.67.68.69-.70.71.72.73-.74.75.76.77-.78.79.80.81-.82.83.84.85-.86.87.88.89-.90.91.92.93-.94.95.96.97-.98.99.100.101-.102.103.104.105-.106.107.108.109-.110.111.112.113-.114.115.116.117-.118.119.120.121-.122.123.124.125-.126.127.128.129-.130.131.132.133-.134.135.136.137-.138.139.140.141-.142.143.144.145-.146.147.148.149-.150.151.152.153-.154.155.156.157-.158.159.160.161-.162.163.164.165-.166.167.168.169-.170.171.172.173-.174.175.176.177-.178.179.180.181-.182.183.184.185-.186.187.188.189-.190.191.192.193-.194.195.196.197-.198.199.200.201-.202.203.204.205-.206.207.208.209-.210.211.212.213-.214.215.216.217-.218.219.220.221-.222.223.224.225-.226.227.228.229-.230.231.232.233-.234.235.236.237-.238.239.240.241-.242.243.244.245-.246.247.248.249-.250.251.252.253-.254.255