HMMU · HDMU → hmm21.com
HMM Container Tracking
South Korea’s flagship line rebranded from Hyundai Merchant Marine to plain HMM in 2020, but its systems still speak the old name — the tracker sits on the hmm21 domain and documents keep the HDMU code. Knowing that lineage resolves most of the “is this really HMM?” doubts people bring to the search page.
Before opening any tab, let the checker below confirm the prefix and digit. Two owner codes cover the whole fleet, which makes a failed HMM lookup far more likely to be a wrong-tab problem than a wrong-number problem.
4 letters + 7 digits, printed on the doors
HMM prefixes: HMMU and HDMU
The fleet registers just two codes. HDMU dates from the Hyundai Merchant Marine decades; HMMU arrived with the shortened brand. Both resolve to HMM in the BIC register and both search identically at hmm21.com, so the code on the door tells you roughly when the box joined the fleet and nothing more.
HMM B/L numbers: HDMU on every document
Bills of lading carry HDMU — the rebrand changed the logo but not the SCAC, because swapping a filing code registered with customs authorities worldwide is a far bigger job than repainting ships. Paste the HDMU number under the B/L tab specifically; the container tab will reject it even though the string looks plausible.
Using the hmm21.com tracker
Select the tab matching your identifier first — container, B/L or booking — then search; that ordering is the whole trick to hmm21.com. Our browser test confirmed the page ignores anything appended to the URL, so bookmarks can only take you to the empty form. For ongoing shipments the HMM e-Service app keeps a watch list, and the Hi Quote platform quotes rates instantly if you are still at the booking stage.
| Container number | ✓ yes |
|---|---|
| Bill of lading (B/L) | ✓ yes |
| Booking reference | ✓ yes |
| Pre-filled link | — no |
| Mobile app | ✓ yes |
Browser-verified 2026-08-03
- Alliance
- Premier Alliance · ONE tracking, Yang Ming tracking
- Headquarters
- Seoul, South Korea
- Founded
- 1976
- Fleet rank (Alphaliner, 2026)
- #8 worldwide
Founded in Seoul on 25 March 1976 and rebranded from Hyundai Merchant Marine in 2020, HMM now operates the world’s eighth-largest fleet and joined ONE and Yang Ming in the Premier Alliance when it launched on 9 February 2025.
Frequently asked questions
Why does my HMM number return nothing on hmm21.com?
Check the tab before the number: the tracker separates container, B/L and booking searches, and each tab validates its own format. A correct HDMU document number under the container tab simply fails.
Is HMM the same company as Hyundai Merchant Marine?
Yes — the line rebranded to HMM in 2020 and is no longer tied to the Hyundai Motor group. The hmm21.com domain and the HDMU document code both carry over from the old name.
What is the difference between HMMU and HDMU on a container?
Only vintage — HDMU boxes were coded under the Hyundai Merchant Marine name, HMMU under the current brand; the BIC register assigns both to HMM and the tracker treats them identically.
Which alliance is HMM in now?
The Premier Alliance, effective 9 February 2025, alongside ONE and Yang Ming. Your HMM booking may load on a partner ship, but events still publish through hmm21.com.
What is HMM Hi Quote?
Hi Quote is HMM’s instant-quotation platform — you get a bookable rate online rather than waiting on a sales desk. It sits beside, not inside, the Track & Trace tool.