DSF2®

DSF 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

First Class Mail

Periodicals

Periodicals

Standard Mail

Standard Mail

Description

What is DSF?

The DSF Product identifies whether a ZIP + 4® coded address is currently represented in the USPS® delivery file as a known address record. The DSF 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. DSF 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 DSF?

Once you have decided to apply to become a DSF, 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 $114,000.00.

Featured Resources

Applications/ Forms
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®).

Applications/ Forms
07/12/2018
DSF2® Licensee Agreement

This document provides a license agreement for DSF2®.

Contact Lists
06/06/2019
DSF2® Licensees

This document contains a list of DSF2® licensed providers with contact information.

Tech Guides
03/02/2018
Advertising Technical Guide

Advertising technical guide for licensed products.

Tech Guides
DSF2® Interface Developers Guide

This document provides a technical guide for DSF2® interface developers.

Tech Guides
DSF2® Flat File Interface Developers Guide

This document contains a technical guide for DSF2® flat file interface developers.

Fact Sheets
Information on Public Seed Records

This document provides facts and additional information on Public Seed records.

Fact Sheets
DSF2® Definition of Throwback Table

This document contains a throwback table for DSF2®.

Quick Service Guides
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.

Quick Service Guides
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.

User Guides
05/30/2018
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.

User Guides
03/13/2017
How the Educational/Seasonal Indicator is used

New DSF2 Educational/Seasonal Indicator.

Fact Sheets
05/16/2019
Licensing Fees

This document contains information about licensing fees for USPS® Licensed Products.

DSF2® Developer Resources

Tech Guides
DSF2® Interface Developers Guide

This document provides a technical guide for DSF2® interface developers.

Tech Guides
DSF2® Flat File Interface Developers Guide

This document contains a technical guide for DSF2® flat file interface developers.

Announcements
07/30/2018
Modifications to DSF2® License and Supporting Documents

This document lists modifications to DSF2® license agreement and supporting documents.

Fact Sheets
DSF2® Definition of Throwback Table

This document contains a throwback table for DSF2®.

DPV®/DSF2® License Performance Requirements (LPR) Updates

DSF2® Licensing & Certification Resources

Applications/ Forms
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®).

Tech Guides
03/02/2018
Advertising Technical Guide

Advertising technical guide for licensed products.

Fact Sheets
Information on Public Seed Records

This document provides facts and additional information on Public Seed records.

Quick Service Guides
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

Announcements
11/22/2017
No-Stats Increase (November 22, 2017)

No-Stat Record Increase

Announcements
07/24/2017
Release Notes
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.

Release Notes
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.

Announcements
07/27/2016
Licensing Announcement: Updated Electronic Product Fulfillment (EPF) Download Manager (July 27, 2016)

Download Managaer for DSF2®, DPV®, NCOALink®, SuiteLink®,  and AMS API.

Announcements
06/14/2016
Annual Renewal Invoices on Electronic Product Fulfillment (EPF)

As a continuous effort to streamline all of the USPS® licensed products through the utilization of the EPF website, the Licensing Department will facilitate the annual license renewal process by posting renewal invoices to EPF.

Fact Sheets
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.

Announcements
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).

Announcements
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.

Announcements
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.

Announcements
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.

Announcements
01/11/2013
Licensing Announcement: DSF2® Pricing Changes Reminder (January 11, 2013)

As a reminder, effective January 27, the DSF2® licensing fees will change.

Announcements
12/07/2012
Licensing Announcement: DSF2® Price Change (December 7, 2012)

As a result of the USPS® Domestic and International Mailing Services Price Change, effective January 27, 2013, the DSF2® licensing fees will change.

Announcements
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.

Announcements
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.

Announcements
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.

Announcements
12/21/2011
Licensing Announcement: DSF2® Price Changes (December 21, 2011)

As a result of the USPS Domestic and International Mailing Services Price Change, effective January 22, 2012, the DSF2 licensing fees will change.

Announcements
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.

Announcements
03/17/2011
Licensing Announcement: DSF2® Pricing Changes Reminder (March 17, 2011)

As a reminder, effective April 17, the DSF2® licensing fees will change.

Announcements
02/04/2011
Licensing Announcement: DSF2® Pricing Changes (February 4, 2011)

Effective April 17, the DSF2® licensing fees will change.

Announcements
10/20/2010
Licensing Announcement: DSF2® Updated LPR (October 20, 2010)

The DSF2® Licensee Performance Requirements (LPR) has been updated.

Announcements
10/15/2010
Licensing Announcement: DSF2® Updated LPR (October 15, 2010)

The DSF2® Licensee Performance Requirements (LPR) has been updated.

Announcements
10/15/2010
Licensing Announcement: DSF2® Monthly Reports (October 15, 2010)

The USPS® has updated the DSF2® monthly report log layout to clarify and define the specific data and/or data counts to be populated in each field of the report.

Announcements
01/25/2008
Licensing Announcement: DPV® Known False Positives (January 25, 2008)

Below are important announcements regarding the DPV Known False Positive files, a DSF2 clarification on False Positive Reporting, and maintenance of False Positive reports.

Announcements
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.

Announcements
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 DSF licensing and certification process, please contact the Move Update Support Department at 1-800-589-5766.