I need to know which IP address I was using two days ago. Is there any log file in OS X that contains this information?
Update: And Chrome for Mac could store this information somewhere?
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It's too late for you now, but you can get it to start logging things like this by running…
sudo ipconfig setverbose 1
…at every boot.
Then you can search for "network changed" in the All Messages ASL log stream in
/Applications/Utilities/Console.app, or in
/var/log/system.log[.#.gz], or in
From the possible duplicate:
Your modem/router might keep logs on which IP the DSL was registered to. Usually the modem's logs/UI is accessible by navigating to its IP through your browser.
My modem keeps a firewall log. You may be able to look at your modem to find out source/destination addresses and see it there.