A KNXnet/IP Interface device is a hardware device which supports KNXnet/IP Tunnelling only. A single interface, such as the Weinzierl 730 and the Siemens N 148/22 may support multiple KNXnet/IP Tunnelling connections. These devices can have simultaneous tunnelling connections which are managed by defining multiple KNX individual device addresses on the device. In the KNXnet/IP driver, this is called the Individual Device Address and allows the KNX network to be accessed by both ETS and the KNXnet/IP driver.