The NI Network Browser enables web-based detection and configuration of National Instruments network devices, such as cRIO and PXI controllers. It also provides a console viewer and file browser for NI LabVIEW Real-Time targets
In order for your targets to appear in the Network Browser, you must install LabVIEW Real-Time 10.0 or higher and NI Web-based Configuration and Monitoring support to your target using the LabVIEW Software Wizard in Measurement & Automation Explorer (MAX) Remote Systems.
FP-160x and unconfigured devices do not support setting a hostname, which is why this field is blank. For other NI devices with a blank hostname, you can set it through MAX or through the device's web configuration page.