IFC4 Add2 (2016) IFC4 Add1 (2015) IFC4 (March 2013)[5] ifcXML2x3 (June 2007) IFC2x3 (February 2006) ifcXML2 for IFC2x2 add1 (RC2) IFC2x2 Addendum 1 (July 2004) ifcXML2 for IFC2x2 (RC1) IFC 2x2 IFC 2x Addendum 1 ifcXML1 for IFC2x and IFC2x Addendum 1 IFC 2x IFC 2.0 (March 1999) IFC 1.5.1 (September 1998) IFC 1.5 (November 1997)[2] IFC 1.0 (June 1996)