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Many FTP servers will report their operating system back to an FTP client in response to the SYST command. Their response is not always very readable though - "UNIX Type: L8 Version: BSD-199506" doesnt exactly make it obvious what the distribution of UNIX is in this case. This page lists FTP server SYST responses with the operating systems that produced them.
| Response | Operating System | FTP Server |
| UNIX emulated by FileZilla | Windows / Windows NT | FileZilla Server 0.9.22 beta |
| UNIX Type: L8 Version: SVR4 | SGI IRIX 6.5 | unknown |
| VMS OpenVMS v7.2 on node... | OpenVMS Alpha v7.2 | Digital TCP/IP services for OpenVMS |
| UNIX Type: L8 Version: Digital UNIX V4.0 (Rev. 1229) | Digital UNIX 4.0F |
| Response | Operating System |
| UNIX Type: L8 | SunOS (BSD or System V Solaris) |
| UNIX Type: L8 Version: BSD-198911 | OSF/1 on DEC Alphas |
| UNIX Type: L8 Version: BSD-43 | NeXTSTEP 3.2 |
| UNIX Type: L8 Version: BSD-199506 | NetBSD (from 1997ish usenet post) |
| UNIX Type: L8 Version: BSD-43 | OPENSTEP 4.2 |