Yup. I typed my French ZIP code (code postal) and this guessed a US city... But the author has a point. Combine it with some approximate country-level geolocat

Yup. I typed my French ZIP code (code postal) and this guessed a US city... But the author has a point. Combine it with some approximate country-level geolocate of the web client and this would work perfectly 99% of the time modulo edge cases like VPN users.