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Air transport, see information here

Sea transport, see information here (register for free access)

Inland transport:

Country identification (in approval marks)

According to Chapters 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7 and 6.8, certain marks on packagings, including IBCs and large packagings, pressure receptacles, portable tanks and bulk containers should indicate the State authorizing the allocation of the mark or the State of approval by the distinguishing sign of the State of registration used on motor vehicles and trailers in international road traffic, e.g. in accordance with the Geneva Convention on Road Traffic of 1949 or the Vienna Convention on Road Traffic of 1968.

The signs notified to the Secretary-General of the United Nations in relation to these conventions may be found here
Governments that exceptionally use a different sign should inform the secretariat accordingly.

Exceptions notified to the secretariat:
Canada: CA  (instead of CDN)
United Kingdom: GB (instead of UK)