A China Post tracking number is 13 characters: two letters, nine digits, two letters (for example LZ485603827CN). If your number is 14 to 18 characters, starts with something like AMTS, JCZ or HHD, or ends in FS, DH or YQ, it was issued by a freight forwarder, not by China Post. The parcel is real. The number just does not belong to the postal system, so China Post’s tracker will keep rejecting it.
You typed the number into a tracker. The page came back with “please enter a valid 13-digit tracking number.” You counted. Your number has 15 characters, or 11, or it has letters at both ends that are not a country code.
Nothing is wrong with your order, and in most cases nothing is wrong with the number either. You are just holding the wrong kind of number, and no amount of retyping will make a postal database accept it.
This is one of the most common confusions on the China Post forum. Across 4,523 user posts we collected from 2024 to 2026, 25 people explicitly complained about the 13-digit rule and 60 said their number came back invalid, unrecognized, or with no information. Almost none of them had a fake number. They had an agent number.
The 13-digit rule is real, but it is narrower than you think
The 13-character format comes from the Universal Postal Union, the body that coordinates mail between countries. Every postal operator in the world uses it, and the shape is always the same:
| Part | What it is | Example |
|---|---|---|
| Chars 1-2 | Service type | LZ = registered air |
| Chars 3-11 | 9 digits, last is a check digit | 485603827 |
| Chars 12-13 | Issuing country | CN = China |
That last pair is the part people miss. The two letters at the end are not decoration and they are not a service code. They are the country of the postal operator that created the number. CY…DE was issued by Deutsche Post. LM…CN was issued by China Post. LK…AU was issued by Australia Post. This is why a “China Post” order sometimes arrives with a German-looking number: your parcel came back, or it was shipped from a European warehouse.
So when China Post’s site says “must be 13 digits,” it is not being difficult. It is checking a format, the same way a form checks a ZIP code. A 15-character agent number fails that check before anyone looks at whether the parcel exists.
Decode your number in about ten seconds
You do not need a tool for this. Count the characters, then look at the shape.
| If your number looks like this | What it is, and where it tracks |
|---|---|
| 13 chars: 2 letters, 9 digits, 2 letters (LZ…CN, EV…CN, CP…CN) | A China Post postal number. Track it on China Post, 17track, and often the destination post. |
| 13 chars, ending in another country (CY…DE, CR…DE, CC…NL) | A postal number from that country. Track it with that country’s post, not China Post. |
| 15 chars, AMTS…FS | A freight forwarder number. Track it on the forwarder’s own site. |
| 15 chars, JCZ…DH | A JCEX / JC Express agent number. Track it on the JCEX site. |
| 15 chars, HHD…YQ | Another consolidator number. Usually no public tracker; ask the seller. |
| 11 chars, ZP or ZS plus 9 digits | China Post economy mail. No destination scans, so China Post’s database is the only source. |
| All digits, 10 to 22 of them | An order number, not a tracking number. Check the seller’s order page. |
If your number is in the first row, the tracker should work and the problem is somewhere else. If it is in any other row, you now know why the China Post page keeps saying no.
AMTS…FS: a private agent, not China Post
This is the number that causes the most confusion right now. In our 2026 posts, AMTS numbers appeared 256 times, and they all look like this: AMTS000315531FS. Four letters, nine digits, two letters. Fifteen characters.
The forum’s volunteer team has answered this one hundreds of times, and their answer is always the same: “AMTS000315531FS is not a China Post parcel. It is from a private shipping agent called MTS.”
That is the whole mystery. MTS (sometimes written AMT) is a freight forwarder. A seller hands a batch of parcels to the forwarder, the forwarder books cargo space, and the parcels fly as freight rather than as mail. The forwarder prints its own labels with its own numbering scheme, and those labels are what the buyer receives.
The parcel still moves. It still clears customs. It still gets delivered, usually by USPS or the local post. If you want to know which company that will be, our last-mile carrier guide lists them by country. What it does not do is appear in the postal system under that number, because the number was never part of the postal system.
When people do find it, they usually find it on the forwarder’s site, and the status is coarser than they expect: “arrived in destination country,” “delivered,” and not much in between. One buyer in the sample was told his AMTS parcel had been delivered in Cambridge, Massachusetts, on a date when nothing arrived. The forwarder’s record was right about the delivery and wrong about the address, because the seller had printed the wrong one.
JCZ…DH and HHD…YQ: the same story, different companies
JCZ numbers look like JCZ0812005984DH and showed up 38 times. The volunteer answer: “It is from a private shipping agent called JCEX.” JC Express is a China-based cross-border logistics company that serves a lot of independent sellers. Its tracking is decent while the parcel is in China and thin once it hands off abroad.
HHD numbers look like HHD8387864195YQ and appeared 28 times. Same structure, different consolidator. The volunteer replies for these are usually a single line: “just arrived in the USA, it is on the way to destination.” No local carrier name, no local number, because the consolidator does not pass one back.
None of these are scams by default. They are a normal, cheap way to move small parcels, and most of them arrive. The problem is that they look almost, but not quite, like postal numbers, so buyers assume the tracker is broken instead of assuming they are on the wrong website.
Z numbers: China Post, but the cheap lane
Z numbers are a different case, and this is where people get genuinely misled. A number like ZP14934864101 or ZS19695265299 is not 13 characters. It is ZP or ZS plus nine digits, and it is issued by China Post for economy mail.
Ask the volunteer team about one and you get an answer that explains a lot: “ZP14934864101 is economical class mail. USPS does not tracking number for such parcel. You can’t track it in usps.com. China Post database shows it was delivered in Bothell, WA today.”
Read that again. China Post knows the parcel was delivered. USPS, which physically delivered it, has no tracking entry for it, because the cheap rate does not include destination scans. The parcel is not invisible. The last mile just was not paid to report. This is the same trade-off explained in our EMS vs ePacket vs registered mail comparison.
The same applies to UU…CN numbers, which China Post calls small packet parcels. The forum answer for those is blunt: “It cannot be tracked in the USPS system. We only know that the goods arrived in the USA on June 17.”
This is also where scams hide. The volunteers warn that some sellers use cheap ZC-prefixed parcels precisely because nothing can be verified at the destination: “Many bad sellers use such ZC*** parcel to do online shopping scam.” The number is real, the shipment may not be.
Forwarder number vs postal number: the three layers
Every international parcel from China passes through up to three layers, and each layer has its own number. The seller or platform gives you an order number. The freight forwarder, if there is one, gives you its own 15-character number. The postal system, when the parcel enters it, gives you the 13-character number. Knowing which layer you are looking at tells you who can actually help.
| Question | Postal number | Forwarder number |
|---|---|---|
| Who issues it | China Post or origin post | A private company |
| Format | Always 13 characters | 14-18 chars, any pattern |
| UPU network | Yes | No, moves as freight |
| Destination scans | Usually | Rarely, agent site only |
| Who can trace it | 11183 or the local post | The forwarder, via the seller |
| Who refunds you | Nobody | The seller or the platform |
A postal number is created at the counter or the sorting center, enters the global mail network, and gets scanned at every exchange. A forwarder number is created by a private company, travels as air cargo, and is scanned by that company’s own staff. The two systems do not talk to each other, which is why pasting an AMTS number into a postal tracker returns nothing.
This is the part that changes what you should do. With a postal number, you have two customer service desks you can call. With a forwarder number, you have zero, because you are not the forwarder’s customer. The seller is. Your leverage is the seller and the platform, not the shipping company.
Where to actually look
Match the site to the number:
- AMTS…FS: the MTS/AMT agent site. If that fails, ask the seller for a screenshot from their shipping dashboard.
- JCZ…DH: the JCEX site. It usually shows China-side events and an arrival scan.
- HHD…YQ: usually no public tracker. Ask the seller; the consolidator answers them, not you.
- ZP, ZS, ZC, UU: China Post’s own tracker or 17track. Expect delivery-level events only, with no destination scans.
- 13 characters ending in CN: China Post first, then the destination carrier (USPS, Canada Post, Royal Mail, Australia Post).
- 13 characters ending in another country: that country’s postal operator, not China Post.
One practical note: 17track and similar aggregators often recognize agent prefixes that China Post’s own site rejects. They are not magic. They simply query more than one database. If an aggregator shows a forwarder route, that is a sign you were never on a postal number.
What to send the seller
Do not open with “your tracking number is fake.” It gives the seller an easy argument. Ask for the layer you are missing:
“My number is AMTS000315531FS. It is 15 characters, so it is not a China Post number and I cannot track it. Can you send me the carrier name and the local tracking number, or a screenshot of the delivery record? If there is no local number, please confirm which company is delivering it and the date it was handed over.”
That message does three things. It shows you understand the number, it asks for something specific, and it creates a written record you can attach to a dispute later. Sellers respond to it far more often than to a paragraph about how long you have waited.
Red flags worth taking seriously
- The number returns nothing anywhere. Not on the postal site, not on the forwarder site, not on an aggregator. The volunteer line is direct: “No tracking record means your seller didn’t ship anything.”
- The seller insists it is a China Post number. Count the characters. If it is not 13, that claim is false, and a seller who is wrong about this is often wrong about other things.
- The number shows delivered, but to another city or state. Ask for the delivery address on file. A wrong label is a seller error, and it is grounds for a refund.
- The prefix is ZC and the price was suspiciously low. This is the pattern the volunteers flag as a common shopping scam.
- The seller asks for more money to “release” or “retrack” the parcel. No legitimate carrier charges the receiver to release a parcel that is already in the network.
Quick answers
Is an AMTS number fake? Usually not. It is a real number issued by a private forwarder. It is just not a postal number, so China Post cannot see it.
Can China Post track a forwarder number? No. The parcel may still be in China Post’s hands at the last mile, but the number was never registered in the postal system.
Why does my number have 15 characters? Because it was not built to the UPU standard. Postal numbers are always 13 characters. Anything longer belongs to a commercial system.
Why does USPS say “not found” for a parcel that was delivered? Economy mail does not include destination scans. China Post’s database can show delivery while USPS has no record at all.
Should I panic if the tracker rejects my number? No. Check the length first. If it is not 13 characters, you are on the wrong tracker, and the right one belongs to the company that printed the label.
If the number turns out to be a dead end and the seller stops answering, the next step is not another tracker. It is a written request with a deadline, then a platform case. Our refund and chargeback guide lays out the timing, and the postal number format guide covers what a real 13-character number should look like.
One last thing worth knowing: the number tells you which service you bought. If a seller promised EMS speed but sent an agent number, the parcel is not traveling as EMS no matter what the listing said. That is a conversation to have with the seller, and it is a much stronger one when you can point at the character count.
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