The US mailing service is continuously rendering its services to many states of USA.
Nearly the USPS delivers mails to 155 million of industrial areas, houses and other post boxes.
The prefix is use to route the package in the USPS main plants.
So you see that the IMpb barcode actually combines routing and tracking!
It is advised to check with the sender if you are not sure what the number is.All product and company names are trademarks™ or registered® trademarks of their respective holders.Use of them does not imply any affiliation with or endorsement by them. (USPS)USPS First Class Mail with Delivery Confirmation (except Letters and Flat Envelopes)USPS Parcel Select USPS Priority Mail USPS Priority Mail Express Express 1 (USPS)USPS Priority Mail USPS Priority Mail Express Canada Post Expedited Parcel Library Books Priority Regular Parcel Xpresspost Xpresspost Certified Fed Ex Fed Ex 1Day® Freight Fed Ex 2Day®Fed Ex 2Day® A. Fed Ex 2Day® Freight Fed Ex 3Day® Freight Fed Ex Express Saver®Fed Ex Express Saver® (International)Fed Ex First Overnight®Fed Ex First Overnight® Freight Fed Ex Ground®Fed Ex Home Delivery®Fed Ex Priority Overnight®Fed Ex Smart Post Parcel Select Fed Ex Smart Post Parcel Select Lightweight Fed Ex Smart Post Presorted Standard Fed Ex Smart Post® Bound Printed Matter Fed Ex Smart Post® Media Fed Ex Smart Post® Returns Fed Ex Standard Overnight® UPSEconomy Mail Innovations (International)Expedited Mail Innovations Mail Innovations - First Class Mail Innovations - Priority Mail Priority Mail Innovations (International)UPS 2nd Day Air AM®UPS 2nd Day Air®UPS 3 Day Select®UPS 3 Day Select® (International)UPS Expedited UPS Express Early A. i've recently purchased an ebay item where the seller used the usps priority mail to ship it..kindly enough sent me the tracking information for it...