The following table lists the codes and descriptions for platforms.
| Category code | Description |
| 001 | Windows Client Application |
| 002 | Mac OS Client Application |
| 003 | UNIX/Linux Client Application |
| 004 | Novell Client Application |
| 075 | Windows Server Application or Service |
| 076 | Mac OS Server Application or Service |
| 077 | UNIX/Linux Server Application or Service |
| 078 | Novell Server Application or Service |
| 150 | Networked Hardware Device (router, switch, printer, etc.) Application or Service |
| 252 | Multi-Platform Client Application |
| 253 | Multi-Platform Server Application or Service |
| 254 | Other Client Application |
| 255 | Other Service or Server Application |