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USPS Tracking Number Format Validator

Validate your USPS tracking number format online. Check if your tracking code is valid before tracking your shipment.

Why is my tracking number invalid?

  • The tracking number has an incorrect number of characters.
  • The tracking number does not start with a valid prefix.
  • The tracking number contains invalid characters.
  • There may be a typo or missing digit in the tracking number.

Tips before tracking your shipment

  • Always copy and paste the tracking number directly from the carrier email or receipt.
  • Make sure you are using the correct carrier for your tracking number.
  • Recently created tracking numbers may take some time to become active.