Indonesia Internet Domain Names Registry Association (PANDI) hosts helpdesk function as a part of .id domain management. It is a one-stop facility for all registrants and the public to submit questions and complaints regarding .id domain names. Previously, helpdesk function had poor performance since its business processes were manual and slow. This research aimed to design Information Technology Service Management (ITSM) implementation as guidelines for PANDI helpdesk. It demonstrated case study research using qualitative approach by involving helpdesk officers, and c-level in depth interview. This research relied on ITIL V3 2011 framework to generate ITSM design: service catalog, Service Level Agreement, and Standard Operating Procedures. It resulted in tracking status, priority label, reporting feature, and service categories can be added on the application side. Those artifacts guided helpdesk to improve the quality of services provided by PANDI. They consisted of a service catalog that includes 11 Customer Facing Service (CFS) and Resource Facing Service (RFS), five SLAs for helpdesk business process services, and three SOPs for account changes request service.