AutoCAD DXF Versions

The following are the different version codes for AutoCAD drawings:

MC0.0 - DWG Release 1.1
AC1.2 - DWG Release 1.2
AC1.4 - DWG Release 1.4
AC1.50 - DWG Release 2.0
AC2.10 - DWG Release 2.10
AC1002 - DWG Release 2.5
AC1003 - DWG Release 2.6
AC1004 - DWG Release 9
AC1006 - DWG Release 10
AC1009 - DWG Release 11/12 (LT R1/R2)
AC1012 - DWG Release 13 (LT95)
AC1014 - DWG Release 14, 14.01 (LT97/LT98)
AC1015 - DWG AutoCAD 2000/2000i/2002
AC1018 - DWG AutoCAD 2004/2005/2006
AC1021 - DWG AutoCAD 2007/2008/2009
AC1024 - DWG AutoCAD 2010/2011/2012
AC1027 - DWG AutoCAD 2013/2014/2015/2016/2017
AC1032 - DWG AutoCAD 2018/2019/2020

To view the codes of a particular DXF file, open it within Notepad or other text editor.

Examine the first eight lines of text.

As shown below this DXF data is AC1015 and was exported from AutoCAD 2000/2000i/2002

  0

SECTION

  2

HEADER

  9

$ACADVER

  1

AC1015

The message shown below popped up while importing AC1032 DXF Data.

AD21 does NOT support AutoCAD 2018/2019/2020 DXF data.

That's it  !