A method for tracking shipments of a letter or package shipped by at least one shipper to an address of at least one addressee including printing a bar code on each shipment to be tracked, wherein the bar code includes at least one part for identification of the shipper of the shipment, which is invariable for each shipper, and a shipment rank identification part of each shipment, which is variable for each shipment; and a device for tracking shipments of a letter or package shipped by at least one shipper to an address of at least one addressee including at least one database having at least one user data table listing bar codes of the shipper and address information, and a data table of shipments being tracked listing each shipment by shipper.