You check the country the ASN behind the IP belongs to.

RIRs don't prohibit out-of-region use of IP addresses or ASNs registered in their region. The country an IP is registered in is not necessarily the country it's being used in.

And they are routinely used in exactly this confusing fashion.

ASN is even worse, honestly. If I'm behind starlinks AS then I'm American? AWS, I'm also American? Level 3? American. Colt leased line in my office in Madrid, apparently I'm English.

You are whatever your VPN exit node is.

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