This transaction set transmits organized lists of names and addresses, typically sent by data providers or administrative systems to recipients who need to maintain or update contact information records. The ST (Transaction Set Header) segment initiates the document, while the BGN (Beginning Segment) establishes context such as transaction purpose and date. The mandatory N1 (Name) segment identifies entities being listed, and within each name entry, the LX (Assigned Number) segment organizes individual name structure components through repeating IN2 (Individual Name Structure Components) segments, which break down names into structured parts like given names, surnames, and titles. Optional segments including REF (Reference Identification) for cross-references, COM (Communication Contact Information) for phone and email details, and NX2 (Location ID Component) for geographic identifiers allow senders to include additional relevant data about each person or organization.

For example, a human resources information system at TechCorp Industries might send an X12 101 transaction to their business partner directory service, Delta Directory Solutions, containing an updated list of current employees and their contact information. Within this transmission, the DTM loop establishes the reference date as of the list’s creation. For each employee—such as Sarah Chen in the Marketing department—an N1 segment identifies her, followed by an LX loop containing her IN2 components that separate her full name into given name, surname, and title; her NX2 location identifier tied to the Chicago office; her REF employee ID number; and her COM segments listing her office phone extension and email address. Delta Directory Solutions receives this standardized transmission to synchronize their contact database without manual data entry.