What this tool does
Living in Korea, you get delivery texts in Korean from carriers you may never have heard of: CJ Logistics, Lotte, Hanjin, Logen, Korea Post, Coupang and a dozen smaller ones. Often the message gives a number but not a name you can read, and Korean tracking sites expect you to choose the carrier from a list first. Here you paste the number or the whole message; the page finds the tracking number, works out the carrier from the number's length, its shape, its check digit and any carrier name or web address in the text, and gives you a button that opens that carrier's own tracking page in a new tab with the number already in it.
A delivery text is full of other numbers. Mobile and landline numbers, the 1588-style customer-centre lines, business registration numbers, card-like numbers, dates, prices and anything right after a label such as "order number" are left out, so only tracking numbers get a card. Paste several messages at once and each number gets its own card. There is no account and no sign-in.
For Korea Post numbers there is a "See it here" button that shows the latest status right on this page. Only when you press it is that single number sent, through this site's server, to Korea Post, and this site's server keeps neither the number nor the result. If the lookup is unavailable, the carrier's page button still works. For parcels coming from abroad by courier (UPS, Cainiao LP and so on), "Check customs status at Korea Customs" opens Korea Customs' official tracking page (UNI-PASS, in Korean) in a new tab with the number already in it, and that page searches by itself. For an international mail number, "Copy the number, open Korea Customs (mail)" copies the number and opens Korea Customs' postal page, where you paste it and press the search button.
How to use it
- In your messages app, press and hold the delivery text, copy it, then press "Paste" here. Typing just the number works too.
- Each number found gets a card. When only one carrier fits, the card says which and shows its button; when a few could, it lists them in order — press the one named in your message or order. Every other carrier is under "Try another carrier".
- Press "Track on …" to open the carrier's tracking page in a new tab. Coupang, UPS and a few others don't accept the number in a link, so the button copies the number first, ready to paste on the page that opens.
- For a Korea Post number press "See it here" to see the status on this page. For an incoming international parcel press "Check customs status at Korea Customs" (for international mail: "Copy the number, open Korea Customs (mail)") to see the clearance steps on Korea Customs' own page.
Why some numbers fit more than one carrier
Korean carriers don't publish rules for their tracking numbers. Some lengths are nearly unique — 13 digits is Korea Post, 11 digits is usually Logen, 14 digits starting with 103 is Coupang — but 12-digit numbers are shared by CJ Logistics, Lotte, Hanjin and the convenience-store parcel services. In that case the page checks Lotte's and Logen's last-digit check, ranks the carriers and shows all of them. A carrier name or a carrier web address in the pasted text puts that carrier first.
Parcels from abroad and customs
International mail numbers from shops such as AliExpress or Temu (two letters, nine digits, two letters, like the ones on a postal label) are checked with their check digit and opened in Korea Post's international tracking: once such mail arrives in Korea, Korea Post delivers it under the same number. UPS, FedEx, DHL, USPS, Japan Post and Cainiao numbers open on those companies' pages, and anything else opens on parcelsapp, which searches many carriers worldwide. After customs clearance a Korean carrier often gives the parcel a new number; if tracking stops after clearance, ask the shop or your forwarder for the domestic number.
Your data
Finding the number and the carrier happens on this device. What you paste stays in this browser only, until you press Clear. Carrier buttons and the customs button are plain links to the carrier's or Korea Customs' own page. Only "See it here" sends that one number, through this site's server, to Korea Post; names, addresses and phone numbers are removed from the answer, and the server keeps neither the number nor the result.
Questions and answers
Why can't it always tell which carrier it is?
Several carriers use the same number lengths, and none of them publishes its numbering rules, so the page shows the carriers that fit, most likely first. Pasting the whole message usually settles it, because the carrier's name is in the text.
Where does my number go?
Finding it happens on this device. A carrier button or the customs button opens that carrier's or Korea Customs' page with the number in it (where a page can't take the number in a link, the button copies it for you to paste); from there, that site's own privacy policy applies. Only "See it here" sends that one number through this site's server to Korea Post, and the server keeps neither the number nor the result. Korea Post offers no encrypted (https) address, so the leg from our server to Korea Post carries the number unencrypted. What you paste stays in this browser until you press Clear.
Does it work for Coupang Rocket Delivery?
For an order placed on Coupang, the order list in the Coupang app is the quickest place to follow it. A 14-digit number starting with 103 opens the site of Coupang's delivery company, Coupang Logistics Services. That site doesn't take the number in a link, so the button copies the number first.
How do I follow customs for an overseas order?
Courier numbers from abroad (UPS, Cainiao LP numbers and so on) get a "Check customs status at Korea Customs" button. It opens Korea Customs' import cargo page (UNI-PASS, in Korean) in a new tab with the number already in it, and the page searches by itself, so you see the clearance steps there. Parcels from around New Year may be filed under last year, so in January and February a second link searches last year's records. International mail numbers get "Copy the number, open Korea Customs (mail)" instead: Korea Customs' postal page doesn't take the number in a link, so the button copies it first. Paste it into the empty number box and press the search button at the right; your browser's Translate option can show the page in English. Customs searches by the overseas carrier's number, so before the parcel reaches Korea, or with a Korean domestic number, it may find nothing. Customs may also know it under another number, for example a forwarder's; if nothing shows, ask the shop or your forwarder. On a phone the customs page looks small: spread two fingers to zoom in.
Why does an old number show nothing?
It depends on the carrier, but tracking history usually disappears after about three months. A parcel handed in only a few hours ago may also have no record yet. Try again a day later, or ask the carrier's customer centre.