To build on HT9's example, you can wrap the statement in a FOR command to query additional websites from a file.
First, you would create a file with a list of the websites you wanted to check. Save it as a .txt file. You would also need to download the PSexecTools and add to your path (C:\windows\system32).
Your command to run to check multiple sites might look like this: (Untested, probably needs some additional fixes)
FOR /F %%i in (C:\sites.txt) do PSEXEC //%%i DIR (path) >> (full logfile.txt)
If you can substitute the FTP site for the server name, that would help. If you have Powershell available, this can be done easier and quicker.
This will run through a text file holding the name of the server or FTP path, connect to the machine locally, export the info to a log file (which can be local or remote) and move on to the next until the end of the file (EOF).