The next united states postal service tracking online two digits are a source identifier. The how to Track USPS online number 10 uniquely identifies Endicia as the PC Postage provider. Next is a Mailer ID (MID). MID's are assigned by the USPS to identify the originator of the barcode. The U.S Postal Service users create millions of barcodes per day, we were given several special 6-digit MID’s is the example barcode is 200793. When using a 6-digit MID, we employ the 10 for the source identifier and we can generate up to 100 million unique tracking numbers.USPS Tracking is a postal service to track shipments and packages 

A major benefit of this 3 digit STC is that united states postal service tracking online can reduce the number of barcodes on a package or mail piece. If you’ve ever done COD, Certified Mai, Insured, or Registered Mail, you know that each of these services use a distinct barcode. But with IMpb, these services can be represented with a single ow tbarcode which also provides the tracking function.
USPS special services are often indicated by colored labels. These colors help the Track USPS number Online operational staff identify pieces that need special handling. In the future, you will likely see these colors disappear as the impact of the IMpb becomes more pronounced inside U.S.Postal Service operations. In the transitional period, united states postal service tracking online is creating colored tracking representing the various special services but without any special codes.This an example of a Registered Mail label with new red Label which is very similar to the old Label 200 which carries its own barcode. This was created using DAZzle with the Label 200N added as an image and then printed on a color printer.