Start With the Number
The single most useful thing to know about tracking is that the number itself usually tells you who is carrying the parcel. Once you know the carrier, everything else — where to track, what the statuses mean, who to contact when it stalls — follows from that.
Below are the formats used by the carriers our visitors ask about most, followed by an explanation of how the scan system works and why tracking behaves the way it does.
Tracking Number Formats
| Carrier | Format | Example |
|---|---|---|
| UPS | Begins 1Z, then 16 more characters — 18 in total. Freight and Mail Innovations use other formats. |
1Z999AA10123456784 |
| FedEx | Digits only. Commonly 12 or 15, but 20 and 22-digit numbers also exist depending on the service. | 123456789012 |
| DHL Express | 10 digits, sometimes shown with a leading letter. DHL eCommerce and DHL Paket use different, longer formats. | 1234567890 |
| USPS | Usually 20 to 22 digits with no letters. International items sent through USPS follow the postal format below instead. | 9400111899223197428490 |
| Royal Mail | International: postal format ending GB. Domestic tracked services use their own formats, which vary by product. |
RB123456785GB |
| Poste Italiane | International: postal format ending IT. Domestic parcels are usually a longer numeric string. |
RR123456789IT |
| Aramex | Typically 10 to 12 digits, though this varies between the countries Aramex operates in. | 1234567890 |
Formats change over time and large carriers run several divisions with different numbering. Treat these as strong indicators rather than guarantees — the dispatch email naming the carrier is always more reliable.
The postal format, decoded
If your number looks like RR123456789IT, you are holding a UPU-standard postal tracking number — the format national post offices use for international mail. It carries more information than most people realise.
First two letters — the service
RR registered mail · RB, RC and similar are also registered services · CP a parcel · EE an EMS express item · LZ, UA and others cover unregistered or bulk mail.
Nine digits — the item
The identifier itself. The final digit is a check digit, which is why one mistyped character makes the whole number invalid rather than merely pointing somewhere else.
Last two letters — the origin country
IT Italy · GB United Kingdom · CN China · US United States · DE Germany · FR France · IN India · AE United Arab Emirates.
Why this matters: those last two letters name the origin post office, not the carrier delivering to your door. A parcel numbered …CN starts with China Post and is usually handed to your national postal service for the final leg. That handover is exactly where tracking tends to go quiet for a week.
Carrier Guides
Longer write-ups covering how each carrier scans, how long its gaps normally run, and how to escalate when a parcel stops moving.
How Courier Tracking Actually Works
Almost every complaint about tracking comes from one misunderstanding: people expect it to behave like live location sharing. It does not. Understanding the mechanism explains nearly every frustration.
A label is printed
The number exists from this moment — which is why it can be sent to you days before the carrier has physically seen the parcel.
The barcode gets scanned
At collection, at each depot, on entry and exit from sorting hubs, at customs, and on delivery. Each scan is one line in your history.
Between scans, nothing exists
A parcel crossing an ocean generates no events for days, because there is no scanner in the middle of the Atlantic. The status is not frozen — there is simply nothing new to report.
Events are published
The carrier makes those events available, and sites like this one display them. We add nothing and estimate nothing — if a scan is missing there, it is missing here.
The practical consequence: scan frequency depends on the service, not the price you personally paid. An express parcel might generate eight events in two days; an economy postal item might generate three in three weeks. Neither is broken.
Four Problems, and What Actually Fixes Them
The number returns nothing
Most often the parcel has not been scanned yet. After that: a mistyped character, or a hidden space copied along from an email.
Do this: retype it by hand rather than pasting, then wait 24 hours before assuming anything is wrong.
No updates for days
Normal between major checkpoints, and normal during a handover between two carriers. Also normal across weekends and public holidays in whichever country the parcel is sitting in.
Do this: compare against the estimated delivery date. A gap before that date is usually routine; a gap after it is worth chasing.
Stuck in transit
Customs inspection, a sorting backlog, or a route to a remote area. None of these generate events, so the status appears stalled while the parcel is genuinely moving through a queue.
Do this: allow two to three working days. Then contact the sender — not the carrier — because they hold the contract and can open an investigation.
You picked the wrong carrier
Formats overlap, and large networks split into per-country and per-division operations that do not share a tracking system.
Do this: check the dispatch email for the carrier name, then look for the entry matching your delivery country — DPD (UK) rather than DPD (DE), for example.
Where to Go Next
Know your carrier? Check the parcel.
Enter your number and pick the carrier to see every scan event it has published.
Go to the tracking form