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UPS Tracking Number Format

Published: January 15, 2023
Last Updated: April 23, 2025

This FAQ provides clear, detailed information about UPS tracking numbers, including their formats, service codes, and verification methods. Whether you're tracking a package or troubleshooting an issue, this guide offers practical answers to help you navigate the process with ease.

What is a UPS Tracking Number?

A UPS tracking number is a unique code assigned to each package, allowing you to monitor its journey from shipment to delivery. The most common format is an 18-character alphanumeric code starting with "1Z," though other formats are used for specific services or regions.

Standard "1Z" Format

The 18-character "1Z" tracking number is structured as follows:

1Z xxx xxx yy zzzz zzz c

  • 1Z: Identifies the number as a UPS tracking code.
  • xxx xxx: A 6-character alphanumeric shipper account number (e.g., 662F41).
  • yy: A 2-digit service level code (see Service Codes).
  • zzzz zzz: An 8-digit package identifier (e.g., 68787878).
  • c: A checksum digit to ensure the number’s validity.

Example: 1Z662F416878787827

Other Formats

UPS also uses these tracking number formats:

  • 9-digit numeric: e.g., 234918751, often for legacy or niche services.
  • 10-digit alphanumeric: Starting with "H" (e.g., H1234567890) or "V" (e.g., V9876543210).
  • 12-digit alphanumeric: Variations of the "1Z" format.
  • 18-digit numeric: Typically for freight or international shipments.

Note: To verify a "1Z" tracking number’s checksum, use an online tool like Mike’s checksum calculator (link to be added if available).

Service Codes

The 2-digit service code in a "1Z" tracking number indicates the delivery service used, such as overnight or ground shipping. Below is a non-exhaustive list of common codes:

CodeService
01UPS United States Next Day Air ("Red")
02UPS United States Second Day Air ("Blue")
03UPS United States Ground
12UPS United States Third Day Select
13UPS United States Next Day Air Saver ("Red Saver")
15UPS United States Next Day Air Early A.M.
22UPS United States Ground - Returns Plus - Three Pickup Attempts
32UPS United States Next Day Air Early A.M. - COD
33UPS United States Next Day Air Early A.M. - Saturday Delivery, COD
41UPS United States Next Day Air Early A.M. - Saturday Delivery
42UPS United States Ground - Signature Required
44UPS United States Next Day Air - Saturday Delivery
66UPS United States Worldwide Express
72UPS United States Ground - Collect on Delivery
78UPS United States Ground - Returns Plus - One Pickup Attempt
90UPS United States Ground - Returns - UPS Prints and Mails Label
A0UPS United States Next Day Air Early A.M. - Adult Signature Required
A1UPS United States Next Day Air Early A.M. - Saturday Delivery, Adult Signature Required
A2UPS United States Next Day Air - Adult Signature Required
A8UPS United States Ground - Adult Signature Required
A9UPS United States Next Day Air Early A.M. - Adult Signature Required, COD
AAUPS United States Next Day Air Early A.M. - Saturday Delivery, Adult Signature Required, COD

How to Verify a Tracking Number

To confirm a UPS tracking number is valid:

  1. Check Format and Prefix:

    • Ensure the number is 9, 10, 12, or 18 characters long.
    • Look for a prefix like "1Z," "H," or "V."

  2. Confirm Service Code:

    • For "1Z" numbers, verify the 2-digit code matches a service listed above.

  3. Validate Checksum:

  4. Use UPS Tools:

    • Enter the number in the UPS Mobile App or website to see if it returns package details.

Checksum Calculation

The checksum digit in a "1Z" tracking number helps detect errors. While online tools simplify this, here’s how it works manually:

  1. Take the 17 characters after "1Z" (e.g., 662F416878787827 for 1Z662F416878787827).
  2. Convert letters to numbers (A=2, B=3, ..., Z=0; digits remain unchanged).
  3. Multiply each position by 2 (odd positions) or 3 (even positions).
  4. Sum the results, take the total modulo 10, and subtract from 10 to get a digit (0–9).
  5. Compare this to the final digit of the tracking number.

This process is complex, so most people prefer tools like Mike’s calculator for quick validation.

Example Tracking Numbers

Below are examples of valid UPS tracking numbers:

  • 9-digit: 234918751
  • 18-character "1Z" format:
    • 1Z662F416878787827
    • 1Z001985YW96579840
    • 1Z001985YW99744790
    • 1Z001985YW90838348
    • 1Z001985YW92164287
    • 1ZE8889W0442766202

Tips for Effective Tracking

  • Enter Carefully: Tracking numbers are case-sensitive, so type them exactly as provided.
  • Multiple Packages: Each package in a multi-package shipment has its own tracking number.
  • Signature Requirements: Services like "Signature Required" or "Adult Signature Required" may delay status updates until delivery.
  • Use Digital Tools: The UPS Mobile App (iOS/Android) offers real-time tracking and notifications.
  • Get Alerts: Sign up for UPS My Choice at www.ups.com/mychoice for email or text updates.

International Tracking

For international shipments, such as UPS Worldwide Express:

  • Tracking numbers may use the "1Z" format, 18-digit numeric codes, or region-specific prefixes.
  • Customs processes can affect tracking updates, so allow extra time for international shipments.
  • Visit www.ups.com/track/international or contact UPS Global Support for assistance.

Troubleshooting Common Issues

If you encounter problems while tracking, try these steps:

  1. "Invalid Tracking Number":

    • Verify every character, as typos are common.
    • Confirm it’s a UPS number, not from another carrier like USPS.
    • New tracking numbers may take up to 24 hours to activate.

  2. No Tracking Updates:

    • The package may not have been scanned yet, especially if recently shipped.
    • Contact the shipper to ensure the package was sent.

  3. Incorrect Status:

    • Double-check that you’re tracking the correct package.
    • Call UPS at 1-800-PICK-UPS (1-800-742-5877) for clarification.

  4. Lost Tracking Number:

    • Request the number from the shipper or retailer.
    • Use UPS’s “Track by Reference” feature with details like an order number.

Frequently Asked Questions

Q: How can I tell if a tracking number is valid?
A: Check its length, prefix, and service code. Enter it on UPS’s tracking page or use a checksum tool to confirm.

Q: Is it possible to track a package without a tracking number?
A: Yes, UPS’s “Track by Reference” tool lets you use details like an order or reference number.

Q: Why hasn’t my tracking number updated?
A: The package may not have been scanned yet, or the number could be incorrect. Contact the shipper or UPS for help.

Q: What does “Adult Signature Required” mean?
A: It requires a recipient aged 21 or older to sign, often for high-value or restricted items. Updates may not appear until delivery.

Q: Can I redirect a package after it’s shipped?
A: In some cases, yes. Use UPS My Choice or contact UPS, but note that fees or restrictions may apply.

Q: How long do tracking numbers remain active?
A: Tracking data is typically available for 120 days post-delivery. For older shipments, contact UPS support.

Additional Resources

  • UPS Website: Visit www.ups.com for tracking and support.
  • UPS Mobile App: Available on the App Store and Google Play for convenient tracking.
  • UPS My Choice: Register at www.ups.com/mychoice to manage deliveries.
  • Customer Support: Call 1-800-PICK-UPS (1-800-742-5877) or use live chat on UPS’s website.
  • Social Media: Follow UPS on X for updates and assistance.

For further questions or issues, contact UPS directly or consult their online help center.

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