What is a distinguishing feature of Diners Club regarding its card issuance?

A distinguishing feature of Diners Club is that all card numbers begin with "36." This numbering system is significant because it is part of the ISO/IEC 7812 standard, which assigns specific ranges of card numbers to different credit card companies. The "36" prefix helps identify Diners Club cards and distinguishes them from cards issued by other financial institutions.

This characteristic is particularly important in the context of processing payments and helps merchants quickly recognize the card type during transactions. While other features of Diners Club may include premium services or security measures, the uniqueness of its card number range is a fundamental aspect of its identity in the payments landscape.