| Code | Field | Name | Description |
|---|---|---|---|
| 2.5.5.0 | AttributeSyntaxOID | Undefined | Not a legal syntax. |
| 2.5.5.1 | AttributeSyntaxOID | Object(DN-DN) | The fully qualified name of an object in the directory. |
| 2.5.5.2 | AttributeSyntaxOID | String(Object-Identifier) | The object identifier. |
| 2.5.5.3 | AttributeSyntaxOID | Case-Sensitive String | General String. |
| 2.5.5.4 | AttributeSyntaxOID | CaseIgnoreString(Teletex) | Differentiates uppercase and lowercase. |
| 2.5.5.5 | AttributeSyntaxOID | String(Printable), String(IA5) | Teletex. Does not differentiate uppercase and lowercase. |
| 2.5.5.6 | AttributeSyntaxOID | String(Numeric) | Printable string or IA5-String. |
| 2.5.5.7 | AttributeSyntaxOID | Object(DN-Binary) | Both character sets are case-sensitive. |
| 2.5.5.8 | AttributeSyntaxOID | Boolean | A sequence of digits. |
| 2.5.5.9 | AttributeSyntaxOID | Integer, Enumeration | A distinguished name plus a binary large object. |
| 2.5.5.10 | AttributeSyntaxOID | String(Octet) | TRUE or FALSE values. |
| 2.5.5.11 | AttributeSyntaxOID | String(UTC-Time), String(Generalized-Time) | A 32-bit number or enumeration. |
| 2.5.5.12 | AttributeSyntaxOID | String(Unicode) | A string of bytes. |
| 2.5.5.13 | AttributeSyntaxOID | Object(Presentation-Address) | UTC Time or Generalized-Time. |
| 2.5.5.14 | AttributeSyntaxOID | Object(DN-String) | Unicode string. |
| 2.5.5.15 | AttributeSyntaxOID | String(NT-Sec-Desc) | Presentation address. |
| 2.5.5.16 | AttributeSyntaxOID | LargeInteger | A DN-String plus a Unicode string. |
| 2.5.5.17 | AttributeSyntaxOID | String(Sid) | A Microsoft® Windows NT® Security descriptor. |