How to Check Local IP Address in c#

To get local computer name and local IP address list

string localComputerName = Dns.GetHostName();

IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());

how to check whether an IP address is local

public static bool IsLocalIpAddress(string host)
{
  try
  { // get host IP addresses
    IPAddress[] hostIPs = Dns.GetHostAddresses(host);
    // get local IP addresses
    IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());

    // test if any host IP equals to any local IP or to localhost
    foreach (IPAddress hostIP in hostIPs)
    {
      // is localhost
      if (IPAddress.IsLoopback(hostIP)) return true;
      // is local address
      foreach (IPAddress localIP in localIPs)
      {
        if (hostIP.Equals(localIP)) return true;
      }
    }
  }
  catch { }
  return false;
}

For Test above method

IsLocalIpAddress("localhost");        // true (loopback name)
IsLocalIpAddress("127.0.0.1");        // true (loopback IP)
IsLocalIpAddress("MyNotebook");       // true (my computer name)
IsLocalIpAddress("192.168.0.1");      // true (my IP)
IsLocalIpAddress("NonExistingName");  // false (non existing computer name)
IsLocalIpAddress("99.0.0.1");         // false (non existing IP in my net)

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