What is a USPS POSTNET barcode?
POSTNET (Postal Numeric Encoding Technique) is a legacy USPS barcode that encodes a ZIP Code using tall and short bars. It holds a 5-digit ZIP, a ZIP+4, or a ZIP+4 plus 2-digit delivery point, followed by a check digit.
USPS has retired POSTNET and replaced it with the Intelligent Mail barcode (IMb), which no longer qualifies mail for automation prices with POSTNET. For any current US mailing, use the USPS Intelligent Mail barcode instead.
This generator is useful for reproducing old artwork, testing equipment or education. It encodes the digits you enter and does not validate the address.
What data can USPS POSTNET hold?
Digits only: 5, 9 or 11 digits (ZIP, ZIP+4, or ZIP+4 with delivery point). Spaces are ignored.
Recommended size
POSTNET uses fixed bar heights and spacing defined by USPS. Print at the specified dimensions without stretching.
More Postal Codes barcodes
How to Create a Barcode in 3 Steps
Choose a barcode type
Select a category on the left (e.g. Linear Codes), then the exact type like Code-128.
Enter data & customise
Type your data — we check it live and add check digits. Adjust size, font and colors.
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Why Use QRCodeChamp Barcode Generator
125+ barcode types
Linear, 2D, GS1, postal, healthcare and payment codes.
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Friendly errors with one-click fixes and automatic check digits.
Print-ready PDF
Exact mm sizes, label sheets (Avery, A4, 4×6 thermal).
Bulk barcodes
Paste a list or generate number sequences.
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Frequently Asked Questions
USPS has retired POSTNET in favor of the Intelligent Mail barcode, so use IMb for current mailings.
POSTNET encodes the ZIP Code for routing; PLANET was used for tracking. Their bar patterns are inverted, and both are replaced by IMb.
A 5-digit ZIP, 4-digit add-on and 2-digit delivery point code.