| Classe universal |
| UNIVERSAL 1 | Boolean type |
| UNIVERSAL 2 | Integer type |
| UNIVERSAL 3 | Bitstring type |
| UNIVERSAL 4 | Octetstring type |
| UNIVERSAL 5 | Null type |
| UNIVERSAL 6 | Object identifier type |
| UNIVERSAL 7 | Object descriptor type |
| UNIVERSAL 8 | External type |
| UNIVERSAL 9 | Real type |
| UNIVERSAL 10 | Enumerated type |
| UNIVERSAL 12 à 15 | Reserved forfuture versions of this Recommendation |
| UNIVERSAL 16 | Sequence and Sequence-of types |
| UNIVERSAL 17 | Set and Set-of types |
| UNIVERSAL 18 à 22, 25 à 27 | Character string types |
| UNIVERSAL 23, 24 | Time types |
| UNIVERSAL 28- . . . | Reserved for future versions of this Recommendation |