如何判断IP地址是否私有？
如何判断IP地址是否私有？
提问于 2011-11-14 02:04:54
到目前为止，我有以下代码：
NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in adapters)
{
IPInterfaceProperties properties = adapter.GetIPProperties();
foreach (IPAddressInformation uniCast in properties.UnicastAddresses)
{
// Ignore loop-back addresses & IPv6
if (!IPAddress.IsLoopback(uniCast.Address) &&
uniCast.Address.AddressFamily!= AddressFamily.InterNetworkV6)
Addresses.Add(uniCast.Address);
}
}如何同时过滤内网IP地址？我以同样的方式过滤环回IP地址。
回答 4
Stack Overflow用户
回答已采纳
发布于 2011-11-14 02:27:56
更详细的回应在这里：
private bool _IsPrivate(string ipAddress)
{
int[] ipParts = ipAddress.Split(new String[] { "." }, StringSplitOptions.RemoveEmptyEntries)
.Select(s => int.Parse(s)).ToArray();
// in private ip range
if (ipParts[0] == 10 ||
(ipParts[0] == 192 && ipParts[1] == 168) ||
(ipParts[0] == 172 && (ipParts[1] >= 16 && ipParts[1] <= 31))) {
return true;
}
// IP Address is probably public.
// This doesn't catch some VPN ranges like OpenVPN and Hamachi.
return false;
}Stack Overflow用户
发布于 2016-08-24 18:04:46
执行此操作的最佳方法是使用IP地址类的扩展方法
/// <summary>
/// An extension method to determine if an IP address is internal, as specified in RFC1918
/// </summary>
/// <param name="toTest">The IP address that will be tested</param>
/// <returns>Returns true if the IP is internal, false if it is external</returns>
public static bool IsInternal(this IPAddress toTest)
{
if (IPAddress.IsLoopback(toTest)) return true;
else if (toTest.ToString() == "::1") return false;
byte[] bytes = toTest.GetAddressBytes();
switch( bytes[ 0 ] )
{
case 10:
return true;
case 172:
return bytes[ 1 ] < 32 && bytes[ 1 ] >= 16;
case 192:
return bytes[ 1 ] == 168;
default:
return false;
}
}然后，可以在IP address类的实例上调用该方法
bool isIpInternal = ipAddressInformation.Address.IsInternal();Stack Overflow用户
发布于 2017-08-21 22:24:41
添加了IPv6和本地主机用例。
/* An IP should be considered as internal when:
::1 - IPv6 loopback
10.0.0.0 - 10.255.255.255 (10/8 prefix)
127.0.0.0 - 127.255.255.255 (127/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
*/
public bool IsInternal(string testIp)
{
if(testIp == "::1") return true;
byte[] ip = IPAddress.Parse(testIp).GetAddressBytes();
switch (ip[0])
{
case 10:
case 127:
return true;
case 172:
return ip[1] >= 16 && ip[1] < 32;
case 192:
return ip[1] == 168;
default:
return false;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/8113546
复制相关文章
相似问题