SEGU → Textainer · lessor prefix
SEGU Container Prefix — Textainer (Leasing)
Textainer, a Bermuda-based lessor managing about four million TEU, became part of Stonepeak in 2024 and absorbed the Seaco fleet at the end of 2025.
Its register footprint is the widest of any lessor — seven codes including two inherited from Seaco — which makes Textainer prefixes the ones most often misread as carrier codes.
SEGU was a Seaco code until the fleet passed to Textainer in late 2025; the register now shows Textainer.
4 letters + 7 digits, printed on the doors
SEGU check digit: worked example
S | E | G | U | 3 | 3 | 6 | 3 | 8 | 2 |
|---|---|---|---|---|---|---|---|---|---|
| 30 | 15 | 17 | 32 | 3 | 3 | 6 | 3 | 8 | 2 |
| ×1 | ×2 | ×4 | ×8 | ×16 | ×32 | ×64 | ×128 | ×256 | ×512 |
| 30 | 30 | 68 | 256 | 48 | 96 | 384 | 384 | 2048 | 1024 |
Sum 4368 → 4368 mod 11 = 1 → check digit 1 → SEGU 336382-1
Textainer prefix family
Owner vs operator: the Textainer case
Whatever Textainer code is on the door, the tracking answer lives with the line on your paperwork — Textainer only owns the asset.
Frequently asked questions
Who owns the SEGU container prefix?
SEGU is registered to Textainer, a container leasing company (lessor) — the BIC register lists it together with TGHU, TEXU, TEMU, but the boxes sail in other lines' fleets.
Which line do I track a SEGU container with?
Not with Textainer — a SEGU box is leased, so the tracking data lives with the shipping line named on your booking confirmation or bill of lading; open that line's tracker and paste the SEGU number there.
Is SEGU 3363821 a valid container number?
Yes — SEGU 336382-1 passes ISO 6346 validation: the weighted letter-and-digit sum for SEGU336382 leaves remainder 1 mod 11, giving check digit 1. The worked table for this SEGU example is on this page.
Is SEGU a shipping line prefix or a leasing company prefix?
SEGU is a leasing-company (lessor) prefix — Textainer owns the steel box, while a shipping line operates it, which is why owner and tracker differ.