Randy,

I did a search on the NVidia site looking for infrared and found a support forum.

[Link: nvidia.com]

Found several links in the thread I found.

Scroll down about halfway down and you will see a post that has this + several links

Left: 61570
Right: 61571
Up: 61568
Down: 61569
OK / Select: 61453
Back: 61448
Home: Nothing
Mute / Unmute: Nothing
Play: Nothing
Pause: Nothing
Stop: 61628

[Link: support-shield.nvidia.com]

[Link: forum.kodi.tv]

Looks like the actual Pronto Hex got removed from the forum but there's a handy-dandy link I found which also includes Power On/Off that you can test.

Here's the link you are looking for.

[Link: pastebin.com]

I'm also curious as to why you did not create a new thread for this request vs using a Firestick thread. Are they really the same thing?