What is the meaning of below if condition?

i cannot understand below if condition. if anyone know about it then please help me to understand it.

foreach(QNetworkInterface netInterface, QNetworkInterface::allInterfaces())
{
     if(!(netInterface.flags() & netInterface.IsLoopBack))
     {
          qDebug()<<netInterface.humanReadableName();
          qDebug()<<netInterface.hardwareAddress();
     }
}