Yes.
www.icann.orghttps://en.wikipedia.org/wiki/ICANN is the ONLY official source.
The database they provide can resolve the exit point, though. By geo location when mapped.
If/when people are using a proxy of any kind you are at a loss. Won't work. Needs extra steps. Then it also won't work.
E.g.: The BBC blocking streaming traffic to outside of the UK. Silly. I live in the UK <I don't, but the BBC thinks so, even though they catch the minimalistic tests you want and some more and the BBC uses the most advanced techniques I know of for detection and therefor to circumvent>
I would not pay too much attention to it. Basically worthless - don't tell your marketeers - and with time it will go away. Unless people really need it and subscribe, say for maps.