[英]Calculate in which subnet is IP address
I have an IP address and mask (for example IP is 10.128.20.1, mask is 255.255.248.0). 我有一个IP地址和掩码(例如IP为10.128.20.1,掩码为255.255.248.0)。 How I can calculate, in which subnet range is IP added?
如何计算在哪个子网范围内添加IP?
I try implement founded solution, where I list all subnets by IP and mask and next I do test IP address, whether is in subnet. 我尝试实施已建立的解决方案,在其中按IP和掩码列出所有子网,然后测试IP地址(是否在子网中)。 But I try find easier way.
但我尝试找到更简单的方法。
Thanks, I attach a part of solution: 谢谢,我附上解决方案的一部分:
$ip_addr = "192.168.36.9";
$subnet_mask = "255.255.248.0";
$ip = ip2long($ip_addr);
$nm = ip2long($subnet_mask);
$nw = ($ip & $nm);
$bc = $nw | (~$nm);
echo "IP Address: " . long2ip($ip) . "\n";
echo "Subnet Mask: " . long2ip($nm) . "\n";
echo "Network Address: " . long2ip($nw) . "\n";
echo "Broadcast Address: " . long2ip($bc) . "\n";
echo "Number of Hosts: " . ($bc - $nw - 1) . "\n";
echo "Host Range: " . long2ip($nw + 1) . " -> " . long2ip($bc - 1) . "\n";
This work, if I use zero subnet. 如果我使用零子网,这项工作。 For no zero subnet this example not work.
对于没有零子网的情况,此示例不起作用。
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