USPS Tracking Number Generator

This tool produces fake tracking numbers that look like the 13-character labels USPS uses for registered and international mail: two letters, nine digits, then US, for example RA123456789US. You set the two-letter prefix (the default is RA, the code for registered mail) and how many numbers you want, from 1 to 10. The numbers are random. They are not registered with USPS, they will not return any events on the USPS tracking page, and nothing about them is "valid" beyond having the right length and shape. That makes them useful for one thing: testing software that stores, displays or validates tracking numbers, without waiting for real shipments.

What you can set

• Service indicator: the letters at the start. The tool uses whatever you type, so you can enter RA, EA, CP, LZ or any pair of letters that matches the kind of mail your test needs to imitate. It does not check that the code is a real USPS service.
• Number of tracking numbers: 1 to 10 per click.

Each result appears on a card. The nine digits in the middle are drawn one at a time at random. Real numbers in this format end their digit block with a check digit computed from the first eight; the generator does not compute one, so most results would fail a strict check-digit test. If your validator enforces the checksum, expect these to be rejected, which is itself a useful negative test case.

What it is good for, and what it is not

• Developer test fixtures. Seed an orders table or a shipment API mock with tracking numbers of the correct length, then check that they display, sort and link correctly in your UI.
• Form and regex testing. Confirm that an input field accepts the letters-digits-US pattern, and see how your code handles lowercase or spaces if you edit a result.
• Demo screenshots and training slides. A shipment screen looks more convincing with a tracking number than with a blank field, and a fake number cannot leak a real customer's parcel.
• Not for marketplaces or customers. Some people search for a way to generate valid tracking numbers for dropshipping. This tool cannot do that. A tracking number only means something when the carrier has scanned a label, and giving a buyer a made-up number is fraud on most platforms.

USPS tracking number formats

USPS uses several formats depending on the service. The tool imitates only the first row.

In the 13-character S10 format, the first letter tells you the service class and the second is a serial letter, the eight digits are the item number, the ninth digit is a modulus-11 check digit, and the final two letters are the origin country. Every domestic 22-digit label also ends with a check digit. If you are writing a validator, test both the happy path with real numbers from your own shipments and the failure path with output from this page.

Other test-data generators on the site follow the same idea of right shape, no real record: the Random VIN Number Generator, Random IMEI Number Generator, Random License Plate Generator and Bank Account Number Generator. Browse all developer & test data tools for more.