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How do I know if my passport number includes a number ‘0’ or a letter ‘O’?

Your passport number is made up of numbers and letters. The letter ‘O’ and the number ‘0’ can look very similar. That is why the letter 'O’ is not used in Dutch passport numbers. You will only ever see the number ‘0’. This also applies to identity document numbers.

Entering your passport number

Always make sure you use the number ‘0’ when entering your passport number, for example for:

  • visa applications;
  • ESTA applications for travel to the United States (Electronic System for Travel Authorization);
  • travel bookings; 
  • online check-in for a flight.