ifc to iges conversion is probably related to export of NURB data from BIM data from IFC (Industry Foundation Class) files to IGES format. IFC format is a standard and actually supported in numerous software, typically 3D software for architecture.
Autodesk software, such as AutoCAD / AutoCAD Architecture are natural choice for such conversion as they allow for import of IFC files and offer export to numerous formats, including STEP or IGES.
Updated: March 6, 2023