DSF2®
DSF2® is an approved method outlined in the Domestic Mail Manual for sequencing mail pieces in walk-sequence when not using a simplified address.
Who is DSF2® for?
To become a DSF2® Licensed Service Provider, applicant must be in the business of, or planning to be in the business of, providing address verification and list processing services.
First Class Mail
Periodicals
Standard Mail
Quick Links
Description
What is DSF2®?
The DSF2® Product identifies whether a ZIP + 4® coded address is currently represented in the USPS® delivery file as a known address record. The DSF2® Product contains vacant, residential, business or seasonal address information. It also identifies if an address is delivered to a curb-side mailbox or by a door-slot. This information will allow for more targeted mailings. DSF2® processing is one of the approved methods outlined in the Domestic Mail Manual for sequencing mail pieces in walk-sequence when not using a simplified address.
What documentation do I need for DSF2®?
Once you have decided to apply to become a DSF2®, the next step is to complete the certification process. The process includes the completion of the following documentation:
- Application
- Confidentiality Statement
- Self-Certification Survey
- Key Personnel Listing
- Security Documentation
- Technical Proposal
- Licensee Survey
- Equipment Information
Upon completion of these documents, the license must be executed, including the payment of the appropriate licensing fees.
The annual license fee for DSF2 is $178,000.00.
Featured Resources
02/27/2018
Licensing and Certification Key Personnel Form for DSF2®
This document contains an application form, Licensing and Certification Key Personnel Form, for Delivery Sequence File Second Generation (DSF2®).
07/17/2024
DSF2® License Agreement
This document provides a license agreement for DSF2®.
10/31/2024
DSF2® Licensees
This document contains a list of DSF2® licensed providers with contact information.
03/02/2018
Advertising Technical Guide
Advertising technical guide for licensed products.
DSF2® Interface Developers Guide
This document provides a technical guide for DSF2® interface developers.
DSF2® Flat File Interface Developers Guide
This document contains a technical guide for DSF2® flat file interface developers.
Information on Public Seed Records
This document provides facts and additional information on Public Seed records.
04/28/2008
DSF2® Definition of Throwback Table
This document contains a throwback table for DSF2®.
02/27/2018
DSF2® Certification Package
The following material describes the necessary steps of the certification process to qualify for a license to the DSF2 Licensed Service.
How to know if a Record is not a Business
This document provides a quick service guide to know if a record is not a business.
03/06/2020
DSF2® Licensee Performance Requirements
To achieve DSF2 certification, the Licensee must comply with all requirements and specifications contained within the License Agreement, the most current version of this document, and the most current version of the Interface Developers Guide unless explicitly allowed, prohibited, or modified by USPS in writing.
11/22/2023
DSF2® Licensee Performance Requirements - CASS Cycle O
To achieve DSF2® certification, the Licensee must comply with all requirements and specifications contained within the License Agreement, the most current version of this document, and the most current version of the Interface Developers Guide unless explicitly allowed, prohibited, or modified by USPS in writing.
07/23/2024
Licensing Fees
This document contains information about licensing fees for USPS® Licensed Products.
07/17/2024
Modifications to DSF2® License and Supporting Documents
This document lists modifications to the DSF2® license agreement and supporting documents.
DSF2® Developer Resources
DSF2® Interface Developers Guide
This document provides a technical guide for DSF2® interface developers.
DSF2® Flat File Interface Developers Guide
This document contains a technical guide for DSF2® flat file interface developers.
07/17/2024
Modifications to DSF2® License and Supporting Documents
This document lists modifications to the DSF2® license agreement and supporting documents.
04/28/2008
DSF2® Definition of Throwback Table
This document contains a throwback table for DSF2®.
DSF2® Licensing & Certification Resources
02/27/2018
Licensing and Certification Key Personnel Form for DSF2®
This document contains an application form, Licensing and Certification Key Personnel Form, for Delivery Sequence File Second Generation (DSF2®).
03/02/2018
Advertising Technical Guide
Advertising technical guide for licensed products.
Information on Public Seed Records
This document provides facts and additional information on Public Seed records.
02/27/2018
DSF2® Certification Package
The following material describes the necessary steps of the certification process to qualify for a license to the DSF2 Licensed Service.
DSF2® Archived Announcements
08/26/2016
Updated REST Web Services Documentation
The Electronic Product Fulfillment (EPF) REST Web Services document has been updated to include both USPS® and Akamai server calls.
08/03/2016
PO Box™ Throwback Table in the DPV® Product
In an effort to facilitate and grow the packaged‐service business, the USPS® has made the decision to include the PO Box Throwback table in the DPV and AMS API Products.
03/04/2016
Door Not Accessible (DNA) & No Secure Location (NSL) Tables
In addition to verifying USPS® delivery points, the DPV and DSF2 Products have added two additional hash tables to assist mailers in streamlining delivery to reap the benefits of deliverable mail.
01/26/2016
Licensing Announcement: Issue with Downloading Both SHA-1 and SHA-256 Products on Electronic Product Fulfillment (EPF)
This announcement details an issue with downloading both the SHA‐1 and SHA‐256 versions of the products using the SOAP Web Services (ColdFusion).
01/07/2016
Licensing Announcement: SHA-256 Products on Electronic Product Fulfillment (EPF)
To comply with the recommendations from the December 2014 Office of Inspector (OIG) audit of the NCOALink® program, the USPS® will begin the transition from SHA‐1 to SHA‐256 technology as the method for data encryption.
03/14/2014
Licensing Announcement: Reminder on Electronic Product Fulfillment (EPF) Server Migration
As a reminder, the Electronic Product Fulfillment (EPF) website will be migrated to a new server Saturday, March 15.
05/17/2013
Licensing Announcement: Reminder on Electronic Product Fulfillment (EPF) for Large Files Beta Test
This licensing announcement serves as a reminder that the EPF for Large Files beta test concludes on Saturday, June 15, 2013.
11/29/2012
Licensing Announcement: DPV®/DSF2® Files to Support Hurricane Sandy
To support addresses impacted by Hurricane Sandy, the USPS® is providing vacant and no-stat information via a weekly download from the Electronic Product Fulfillment (EPF) website.
07/25/2012
DPV® PBSA Records
Effective with the August release, the USPS® has included the PBSA (Post Office Box Street Address) records in the following products.
01/17/2012
DPV® CMRA Table Expansion
Effective with the February release of the DPV® monthly data fulfillment, P.O. Box™ (PBSA) records will be added to the CMRA table.
11/02/2011
Licensing Announcement: DSF2® Throwback Table Expansion
In an effort to provide value added enhancements to the traditional P.O. Box™ service, 3,700 postal locations are adding ‘P.O. Box Street Addresses’ (PBSA) to the AMS database.
04/25/2008
Licensing Announcement: DPV®/DSF2® Header Files
DPV and DSF2 Products currently have a very limited header file called month.dat which only contains the product month.
02/17/2005
Footnote Code Changes
As presented at the CASS PIT meeting on February 17, 2005, there are some changes to the Footnote codes and how to process records when there is no delivery type on a match.
Related Products
DPV®
The DPV® Product identifies whether a ZIP + 4® coded address is currently represented in the USPS® delivery file as a known address record. It also allows users to confirm known USPS addresses, as well as, identify potential addressing issues that may hinder delivery.
ZIP + 4® Product
The ZIP + 4® Product is a base reference file that can be accessed by an application to assign the correct ZIP + 4® Code associated with a physical address.
Contact
For more information on the DSF2® licensing and certification process, please contact the Move Update Support Department at 1-800-589-5766.