we have just started using the database and it is set up where we create the user Id and password for our members.. we are keeping an eye on the security of access.. can someone tell me what does it mean to have the following entry in the log file

default logged off at 10:18:44 on 11-Feb-1999 from 163.121.130.21

bearing in mind that we are not using default as the name of this database.. it is not a user or password, we are not the IP # above .. and it indicates that it was a log off and not a log on ..
I am just curious if there is a way to have more info about the user in the log file than log on time and IP#... thanks