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Generally speaking, there's no way to detect if you're using a VPN. They block specific IP ranges belonging to VPN providers.

Learned this the hard way when we moved abroad for a few months and wanted to get our American Netflix on.

No biggie, now we VPN into my home and use that connection to check out US Netflix: their blocking is entirely IP-based.

Exactly what I said in my comment and yet it was downvoted.

Netflix hasn't been able to block all VPNs. VyprVPN still works, for example.