Unknown login

[Bob.Hallam]

I’ve found this entry in my extended log file.
Any ideas? It wasn’t me or anyone else I know at this time of day!
2020 Dec 1 17:28:39
FTP
FTP server: Anonymous user[217.73.83.84] Logout
2020 Dec 1 17:28:30
FTP
FTP server: Anonymous user logged in from 217.73.83.84