AutoCAD supports both the formats from 3ds Max, as well as IGES CAD format (.igs, .iges) so it is probably your best bet for 3DS to IGS conversion. Other than that, some dedicated 3D converters like the 3D Object Converter may be of help and so other 3D modeling tools with 3ds Max format support.
Convert 3ds Max (3D Studio MAX) graphics to IGES 3D exchange format.
We found 9 software records in the database related to .3ds to .igs file format conversion.
Microsoft Windows software - convert 3ds to igs on Windows
Leading 2D and 3D CAD development software from Autodesk
Convert from 3ds file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned 3ds to igs. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
3D viewer and converter with huge file type support
A family of 2D/3D CAD software products for Windows
A widely-used 3D animation application from Autodesk
A converter for 3D formats
A 3D CAD translation softwate
A 3D model converter
A CAD viewer program with conversion capabilities
Apple macOS / Mac OS X software - convert 3ds to igs on OS X
Mac version of popular Autodesk AutoCAD software