The Book Number is an identifier used in passports distinct from the primary passport number. While not all countries use a Book Number, those that do include it as an additional measure to track passport booklets.
Distinguishing Passport and Book Number
Passport Number: A unique identifier for the passport holder. This is the primary number used for travel and visa applications.
Book Number: Refers to the batch or series of passport booklets and may be the same for multiple individuals if they received their passport from the same batch or series.
Helps in inventory and batch tracking of passport booklets.
Can assist in validating the authenticity of a passport.
Where to Find
Often located on the bio-data page of the passport.
Not present in all passports; if unsure, refer to the passport's guidelines or the issuing authority.