The length of a PNR (Passenger Name Record) number depends on whether you are traveling by air or by rail, as different industries use different standards. For airline travel in 2026, a PNR—often called a "Booking Reference" or "Record Locator"—is a unique 6-character alphanumeric code (a combination of letters and numbers). This code serves as the digital "key" to your entire itinerary, storing your name, contact details, and seat preferences. It is easily found on your e-ticket or boarding pass. In contrast, if you are traveling via Indian Railways (IRCTC), the PNR is a strictly numeric 10-digit code. The first three digits of a rail PNR indicate the Passenger Reservation System (PRS) zone from which the ticket was issued (e.g., 2 or 3 for New Delhi), while the last seven digits are randomly generated to ensure uniqueness. Regardless of the number of digits, your PNR should be treated as a sensitive piece of information, much like a password, as anyone with your last name and this code can access your personal travel details or potentially modify your booking through the carrier's website or mobile application.