I miss a question in FAQ:
How do I translate IP to host-names (DNS-lookup)?
Regards
You can do this by going to the Socket Sentry Settings dialog. To get
there, either right-click near the title or right-click on the icon if
you docked it to a panel or click on the configuration button on the
side of the widget. Once you get to the settings dialog, go to Global
Settings and then check "Enable host name lookups".
Enjoy.