HDMU → HMM · carrier prefix
HDMU Container Tracking — HMM-Owned Prefix
Track on hmm21.com — official HMM tracker
HMM, formerly Hyundai Merchant Marine, is South Korea’s national container line and the operator of some of the largest 24,000-TEU vessels ever built.
Its two codes reflect the rebrand: the newer HMM registration circulates beside the Hyundai-era one, both tracked on hmm21.com.
4 letters + 7 digits, printed on the doors
HDMU check digit: worked example
H | D | M | U | 3 | 8 | 6 | 2 | 4 | 8 |
|---|---|---|---|---|---|---|---|---|---|
| 18 | 14 | 24 | 32 | 3 | 8 | 6 | 2 | 4 | 8 |
| ×1 | ×2 | ×4 | ×8 | ×16 | ×32 | ×64 | ×128 | ×256 | ×512 |
| 18 | 28 | 96 | 256 | 48 | 256 | 384 | 256 | 1024 | 4096 |
Sum 6462 → 6462 mod 11 = 5 → check digit 5 → HDMU 386248-5
HMM prefix family
| Prefix | HDMU (this page) HMMU |
|---|
Prefix register verified against two independent sources on 2026-08-03.
Tracking with HMM
hmm21.com verified-negative for deep links — the Track & Trace form is the way in.
Frequently asked questions
Who owns the HDMU container prefix?
HDMU is registered to HMM, founded 1976 — one of 2 prefixes the line holds in the BIC register, alongside HMMU.
How do I track a HDMU container?
Track HDMU containers free on the official HMM tracker at hmm21.com — paste the full 11-character number (like the HDMU example on this page) and no account is needed.
Is HDMU 3862485 a valid container number?
Yes — HDMU 386248-5 passes ISO 6346 validation: the weighted letter-and-digit sum for HDMU386248 leaves remainder 5 mod 11, giving check digit 5. The worked table for this HDMU example is on this page.
Is HDMU a shipping line prefix or a leasing company prefix?
HDMU is a shipping-line (carrier) prefix — HMM both owns the boxes and moves them, so owner and tracker are the same company.