Utility customers utilizing services from Tokyo Gas are assigned a unique, alphanumeric customer code or contract number that typically consists of a specific sequence of digits displayed prominently on monthly billing statements, paper notices, and customer portal accounts. This identification number is essential for managing utility profiles, executing online address moves, paying bills, and contacting customer service representatives regarding gas meter maintenance or tariff adjustments. Because individual customer numbers are private, confidential account credentials unique to each residential or commercial subscriber, they are not published as a universal public figure and must be retrieved directly from personal billing documents or verified through secure customer support channels.