Hi,
On my cRIO-9014 which has an ip address of 192.168.5.1 the address to the file that has the IP is: ftp://192.168.5.1/ni-rt.ini
If you access it programatically from the cRIO itself, you can use c:\ni-rt.ini as the path to open the file.
The IP address is contained in the section [TCP_STACK_CONFIG] of the config file.
Hope that helps!
QFang
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CLD LabVIEW 7.1 to 2016