AutoCAD ® registers the classes listed in the following table. (This may not be a complete list of the classes found in a DXF file. It depends on the applications currently in use by AutoCAD.)
| Default class values |
|---|
| DXF record name code 1 | C++ class name code 2 | Code 90 | Code 280 | Code 281 |
|---|
| ACDBDICTIONARYWDFLT | AcDbDictionaryWithDefault | 0 | 0 | 0 |
| ACDBPLACEHOLDER | AcDbPlaceHolder | 0 | 0 | 0 |
| ARCALIGNEDTEXT | AcDbArcAlignedText | 0 | 0 | 1 |
| DICTIONARYVAR | AcDbDictionaryVar | 0 | 0 | 0 |
| HATCH | AcDbHatch | 0 | 0 | 1 |
| IDBUFFER | AcDbIdBuffer | 0 | 0 | 0 |
| IMAGE | AcDbRasterImage | 127 | 0 | 1 |
| IMAGEDEF | AcDbRasterImageDef | 0 | 0 | 0 |
| IMAGEDEF_REACTOR | AcDbRasterImageDefReactor | 1 | 0 | 0 |
| LAYER_INDEX | AcDbLayerIndex | 0 | 0 | 0 |
| LAYOUT | AcDbLayout | 0 | 0 | 0 |
| LWPOLYLINE | AcDbPolyline | 0 | 0 | 1 |
| OBJECT_PTR | CAseDLPNTableRecord | 1 | 0 | 0 |
| OLE2FRAME | AcDbOle2Frame | 0 | 0 | 1 |
| PLOTSETTINGS | AcDbPlotSettings | 0 | 0 | 0 |
| RASTERVARIABLES | AcDbRasterVariables | 0 | 0 | 0 |
| RTEXT | RText | 0 | 0 | 1 |
| SORTENTSTABLE | AcDbSortentsTable | 0 | 0 | 0 |
| SPATIAL_INDEX | AcDbSpatialIndex | 0 | 0 | 0 |
| SPATIAL_FILTER | AcDbSpatialFilter | 0 | 0 | 0 |
| WIPEOUT | AcDbWipeout | 127 | 0 | 1 |
| WIPEOUTVARIABLES | AcDbWipeoutVariables | 0 | 0 | 0 |