What does a USPS tracking number look like?

USPS uses 4 formats. Examples: 03071790000523483741, 420787459400111206206406260787, 4201002334249200190132607600833457. Most USPS tracking numbers are 20–34 characters long.

How many digits is a USPS tracking number?

A USPS tracking number is typically 20–34 characters, depending on the service used.

How do I check if my USPS tracking number is valid?

USPS tracking numbers include a built-in check digit, so a mistyped number can be caught before you track. Paste yours into Parceler's Tracking Number Format Detector to validate it instantly.

Where do I find my USPS tracking number?

Your USPS tracking number is on the shipping confirmation email or SMS, the receipt or label from the sender, and inside your order details on the store where you bought the item.

How do I track a parcel with Parceler?

Simply enter your tracking number in the search box at the top of this page, click "Track", then select your carrier from the popup. We'll display the full shipment history and current status instantly.

Why do I need to select a carrier manually?

Many carriers use overlapping tracking number formats, so automatic detection can lead to incorrect results. By letting you choose your carrier, we guarantee accurate tracking every single time. You'll find your carrier name on your shipment confirmation email or receipt.

Is Parceler free to use?

Yes! Basic parcel tracking on the web is completely free. Our iOS app is also free to download and use, with optional premium features available for power users who want advanced notifications and analytics.

Which carriers does Parceler support?

Parceler supports over 3,200 carriers including FedEx, UPS, DHL, USPS, Royal Mail, Bluedart, Delhivery, DTDC, Ekart, India Post, Aramex, and hundreds more from across Asia, Europe, Americas, and beyond.

Is the iOS app available on Android?

Currently, Parceler is available exclusively on iOS (iPhone and iPad). An Android version is in active development — sign up with your email to be notified when it launches.

How often is tracking information updated?

Tracking data is pulled directly from carrier systems in real-time whenever you refresh or check a shipment. For the iOS app, background refresh keeps your package list up-to-date automatically throughout the day.

What is the best app to track all my packages in one place?

Parceler is a free, all-in-one parcel tracking app that lets you follow every package from 3,200+ carriers worldwide in a single place — no need to visit each carrier's website. Just paste any tracking number to see real-time status, the full delivery timeline, and a unified map that stitches together carrier handoffs.

Can I track packages from all carriers in one app?

Yes. Parceler is a universal, multi-carrier tracker that supports over 3,200 couriers including FedEx, UPS, DHL, USPS, Royal Mail, Aramex, India Post, Delhivery, Bluedart and DTDC. Add as many shipments as you like and watch them all from one dashboard instead of juggling separate tracking sites.

Do I need an account or sign-up to track a package?

No. You can track any package on the Parceler website for free without creating an account — just enter your tracking number and pick your carrier. Signing up (or using the iOS app) is optional and only unlocks extras like saved shipments and push notifications.

Can I track international orders from Amazon, AliExpress, Temu or SHEIN?

Yes. Once your order ships, the confirmation email lists a tracking number and carrier — for example AliExpress and Temu often ship via Cainiao, and Amazon via Amazon Logistics or a local courier. Paste that number into Parceler to follow the parcel across borders, through customs, and all the way to your door.

Tracking number format

USPS tracking number format

What a USPS tracking number looks like — structure, length and real examples — plus how to check that yours is valid.

USPS issues tracking numbers in 4 formats, shown below with a real-world example for each. Numbers are typically 20–34 characters long. Once you have yours, track it live with Parceler — no account needed.

USPS 20Check-digit verified

0307179000052348374120 characters

USPS 22Check-digit verified

42078745940011120620640626078730 characters

USPS 34v2Check-digit verified

420100233424920019013260760083345734 characters

USPS 91

42022153910102683733100003952130 characters

Track your USPS parcel

Got your number? Paste it in to see the latest status, route and estimated delivery.

How to read a USPS tracking number

Most tracking numbers combine a service or product prefix, a serial number that uniquely identifies your shipment, and (for many carriers) a final check digit used to catch typos. International postal items often follow the UPU S10 standard — two letters, nine digits and a two-letter country code, e.g. RR123456789GB. If a number doesn’t match any known USPS pattern, it may belong to a different carrier or have been entered incorrectly.

Validate any tracking number

USPS tracking number — questions answered

What does a USPS tracking number look like?: USPS uses 4 formats. Examples: 03071790000523483741, 420787459400111206206406260787, 4201002334249200190132607600833457. Most USPS tracking numbers are 20–34 characters long.
How many digits is a USPS tracking number?: A USPS tracking number is typically 20–34 characters, depending on the service used.
How do I check if my USPS tracking number is valid?: USPS tracking numbers include a built-in check digit, so a mistyped number can be caught before you track. Paste yours into Parceler's Tracking Number Format Detector to validate it instantly.
Where do I find my USPS tracking number?: Your USPS tracking number is on the shipping confirmation email or SMS, the receipt or label from the sender, and inside your order details on the store where you bought the item.

USPS tracking guide Tracking Number Format Detector All carriers

USPS tracking number format

Track your USPS parcel

How to read a USPS tracking number

USPS tracking number — questions answered

Common questions,plain answers.

Common questions,
plain answers.