Postal IMpb Labels and Barcodes

If you are shipping parcels through the Post Office, you may have heard about Postal IMpb labels or IMpb barcodes. If not, here is a brief explanation of IMpb.  


What is IMpb? Postal IMpb barcode labels are the Post Offices way of providing you with as much information as possible about the whereabouts of your parcel or mail piece. Enter the barcode tracking number into the postal website and you will see all the tracking information, from start to finish, about your mail piece. And because this barcode helps the Post Office be more efficient at what they can do for you, they are able to pass on to you Commercial Base pricing discounts on each piece you ship with an IMpb label.


Which Mail Classes require an IMpb label?

  • First Class mail Package Services

  • Parcel Select and Parcel Select Lightweight Services

  • Bound Printed Matter

  • Marketing Mail

  • Library Mail

  • Media Mail

All Commercial Parcels:


  • Packages over 13 oz.

  • Priority Mail including Flat Rate Boxes and envelopes

  • Priority Mail Express including Flat Rate Boxes and envelopes


And These Services:


  • Certified Mail

  • USPS Tracking

  • Signature Confirmation

  • Restricted Delivery

  • Return Receipt


OnShip creates IMpb barcoded labels when the service or mail class requires one. There is no need to guess, all the decision making is already done for you. Using OnShip to process your Postal transactions not only qualifies you for Commercial Base Pricing, but OnShip provides you with free Address Corrections and free Insurance up to $50 on Priority Mail and up to $100 on Priority Mail Express.

The OnShip Group, Inc

Atlanta  Chicago  Los Angeles 

Office: 888.442.2089

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