what do tracking numbers for usps look like

what do tracking numbers for usps look like typically follow a specific format that includes 20 or 22 digits, with a combination of letters and numbers. Tracking numbers for USPS shipments begin with a series of letters like “EA,” “LZ,” or “940,” and are followed by a set of numbers. These tracking numbers can be entered into the USPS tracking tool online to get updates on the package’s status. International tracking numbers may have a different format depending on the country of origin.