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In short this piece of code makes a remote call to ipinfo.io to get that information from the IP

const lookup = (callback) => {
  loadJSONP('ipinfo.io', 'sendBack');
  window.sendBack = (resp) => {
    const countryCode = (resp && resp.country) ? resp.country : '';
    callback(countryCode);
  }
};

As you always need to have a lookup table to relate IP to country.