如何计算出没有分配出去的IP地址
现在有一段B类IP地址段119.115.0.0--119.115.255.255, 现在我分配各部门使用,但是还剩那些地址没有分配出去,通过手工计算很复杂,因为有些地址很小,很乱,没有好好管理,所以通过mysql计算一下.另外利用一下mysql的函数inet_aton('119.115.0.0')得出一个整数.另外mysql数据库字段设置了四个字段,起始ip,终止ip,起始IP的整数,终止IP的整数,如何计算出没有分配出去的IP地址. mysql是否单独可以得出吗,还是mysql+php共同完成.多谢各位高手请不吝赐教.
119.115.0.0--119.115.255.255 分配如下地址
119.115.136.132,119.115.136.135
119.115.141.0,119.115.141.15
119.115.136.88,119.115.136.91
回复内容：
现在有一段B类IP地址段119.115.0.0--119.115.255.255, 现在我分配各部门使用,但是还剩那些地址没有分配出去,通过手工计算很复杂,因为有些地址很小,很乱,没有好好管理,所以通过mysql计算一下.另外利用一下mysql的函数inet_aton('119.115.0.0')得出一个整数.另外mysql数据库字段设置了四个字段,起始ip,终止ip,起始IP的整数,终止IP的整数,如何计算出没有分配出去的IP地址. mysql是否单独可以得出吗,还是mysql+php共同完成.多谢各位高手请不吝赐教.
119.115.0.0--119.115.255.255 分配如下地址
119.115.136.132,119.115.136.135
119.115.141.0,119.115.141.15
119.115.136.88,119.115.136.91
首先分网段，你给个一段IP区间有什么用？
网段是由 IP+掩码 才能确定
119.115.0.0--119.115.255.255 分配如下地址
119.115.136.132,119.115.136.135 // 119.115.136.132-135
119.115.141.0,119.115.141.15 //119.115.141.15.0-15
119.115.136.88,119.115.136.91 //119.115.136.88-91 你这是公网地址吧？
第一个地址段： 132-135 132 是 网络号 135 是 广播号 无法用， 你只能用 133 134 这2个IP用
第二个地址段：同上你只能用16-2 = 14个IP 第三个地址段：同上 你只能2个地址段
还有问题，再问我，这是子网划分的知识。
这种事情写个小程序不就搞定了？
按首地址排序一下然后把中间的缺口列出来。
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