I have the strange need to know what my public ip address was from yesterday. Is there a tool to do that?
closed as off topic by Ben Pilbrow, voretaq7♦, EEAA, Bart De Vos, Chopper3 Sep 13 '11 at 20:52
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If you use outlook, find an email sent on past days, and view "raw message" and look in the headers. You could possibly recover it from there.
If you use gmail, look at the bottom of the main mail page (it says "Last account activity, see DETAILS") You can look there too.
If you visited any sites you know the owner of, tell them to look through the logs at what time you visited them, and compare it to your User Agent. (Still not definite, but a good guess).
If your DHCP client is logging the addresses it received you can examine the logs (without knowing what operating system you are using I can't give you any more specific guidance than that).
If your DHCP client is not logging its assigned address you may be able to contact your ISP and get this information, though they will probably ask why you need to know.
If you were manually assigning yourself addresses and didn't write it down you're probably out of luck.