Introduction to the Document Location Number ( DLN). Self-study . What is a DLN. IRM 220.127.116.11.2.1 (01-01-2014) Document Locator Number The document locator number (DLN) is a unique number assigned to every return processed by the Automatic Data Processing (ADP) Systems.
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18.104.22.168.2.1 (01-01-2014)Document Locator Number
22.214.171.124.2.1.1 (01-01-2014)Julian Date
126.96.36.199.2.1.2 (01-01-2014)Sequence Number
The twelfth and thirteenth digits of the DLN are the sequence number.