NBNS (sometimes called WINS) stands for
NetBIO Name Service,
which is a protocol for name resolution.
ipconfigUSE_NBNS must be set to 1 in FreeRTOSIPConfig.h for NBNS to be enabled. As with LLMNR, the application writer must provide the xApplicationDNSQueryHook() callback function which takes a character pointer as a parameter and returns pdTRUE if the name passed into the function matches a name used to identify the node.