Chapter 1 -- DXF Format
Group Code Value Types

Group codes define the type of the associated value as an integer, a floating-point number, or a string, according to the following table of group code ranges. For information about abbreviations and formatting used in this table, see "Formatting Conventions in This Reference."

Group code value types
Code range Group value type

0-9

String. (With the introduction of extended symbol names in AutoCAD 2000, the 255 character limit has been lifted. There is no explicit limit to the number of bytes per line, although most lines should fall within 2049 bytes.)

10-59

Double precision 3D point

60-79

16-bit integer value

90-99

32-bit integer value

100

String (255-character maximum; less for Unicode strings)

102

String (255-character maximum; less for Unicode strings)

105

String representing hexadecimal (hex) handle value

140-147

Double precision scalar floating-point value

170-175

16-bit integer value

280-289

8-bit integer value

300-309

Arbitrary text string

310-319

String representing hex value of binary chunk

320-329

String representing hex handle value

330-369

String representing hex object IDs

370-379

8-bit integer value

380-389

8-bit integer value

390-399

String representing hex handle value

400-409

16-bit integer value

410-419

String

999

Comment (string)

1000-1009

String. (Same limits as indicated with 0-9 code range.)

1010-1059

Floating-point value

1060-1070

16-bit integer value

1071

32-bit integer value