Yes, it is a completely standard and often legally mandated practice for hotels to record your passport number when you travel internationally. In many countries—particularly across Europe, Asia, and Latin America—local laws require hospitality providers to register all foreign guests with the national police or immigration authorities within 24 hours of arrival. This is used for security, tax purposes, and monitoring tourist statistics. Some hotels may even ask for this information at the time of booking to expedite the check-in process. While it might feel intrusive compared to domestic travel in the U.S., it is a routine part of global travel. If you are concerned about privacy in 2026, you can ask the hotel how they store the data, but refusing to provide it may result in the hotel being legally unable to host you. It is a good idea to have a digital photo or a photocopy of your passport's information page on your phone so you can provide the details easily without having to pull out your physical passport in a busy lobby or a public cafe.