Hi there yiux,
Netstat is good for seeing what is CURRENTLY connected to your computer, but for a history of connections, I think you will find your logs very useful. They are generally located in /var/log you should find all sorts of logs (try taking a look at "/var/log/auth.log". Also try using the "last" command.
Many 3rd party apps will also dump their logs here, for example if you are running a webserver with apache, you could try looking in /var/log/apache etc...
Hope that helps.
Luke
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