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eVS Barcode Data Generator

The Electronic Verification System (eVS), also know as the USPS PRS barcode, allows high-volume package mailers and package consolidators to document and pay postage, including special service fees, using electronic manifest files. The files are transmitted over the Internet to a Postal Service™ database. eVS is designed to make it easy for high-volume package mailers to take advantage of destination entry rates.

For more information, consult the following resource: Electronic Verification System (eVS®). Note that the use of GS1-128 barcode symbology is a requirement for the Electronic Verification System (eVS ®).

eFORMz provides the ability to generate this barcode using either hard-coded ‘constant’ values and/or referencing data within the print file using variable assignments. In the example below, the following values are assigned accordingly:

♦ Application Identifier
♦ Service Type Code
♦ Customer ID or DUNS number
♦ Sequential Package ID

Application Identifier: The Application Identifier (AI) is a 2-digit code used within UCC/EAN Code 128 that identifies the barcode as a postal barcode. The AI values for Confirmation Services are 91 and 420, and appear as part of the human-readable printed data. If concatenation is used to include the postal routing code (destination ZIP Code), then both the AI of 91 and 420 must appear as part of the human-readable print for the routing barcode component. Neither Application Identifier 91 nor 420 may appear in parentheses

Service Type Code: Service Type Codes (STCs) are three-digit designators included in the Confirmation Services barcode to identify the class of mail and/or type of Extra Services included on that specific mail item. See Table 1 in Appendix G for the Service Type Codes.

Customer ID/Dun & Bradstreet Number (DUNS): A customer ID number provided by the Postal Service or a DUNS number must be used in the barcode to identify the mailer or the mailer’s client. A DUNS number uniquely identifies businesses at specific geographical locations. Mailers or their clients who need to obtain their DUNS may request it by contacting Dun & Bradstreet at (800) 333-0505 or via the Internet at . Mailers with special ID requirements can contact the eVS program office via

Sequential Package ID: Customers assign a 7-digit Sequential Package Identifier. This string of numbers may be a Variable length field of 2 to 7 digits using the UCC/EAN Code 128 symbology.

Check Digit – MOD 10:
The MOD 10 check digit validates the barcode authenticity. This value is automatically calculated using the barcode generator and is the last (single digit) value of the barcode.

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