This looks like an ISO 6346 shipping container number:
CSQ
U
305438
3
Owner
Category
freight container
freight container
Serial number
Check digit
Check Digit
- ✔︎ Matches (expected
3, got3) - Algorithm: ISO 6346
Links
- “CSQ” in the BIC Code register — bic-code.org
Sources
- ISO 6346:1995 — iso.org
This looks like an IGSN (International Geo Sample Number):
CS
QU3054383
Namespace
Code
Sources
- “What is the IGSN?” — geosamples.org